ad 500: Dál Riada
After several centuries of gradual cross-Channel settlement, the Dál Riadic kings (probably in the person of Fergus Mór, son of Erc) take up residence in Argyll; late 6th–early 7th C sees the first effort of these Scots to conquer the Picts [Kingdom, p. 23; McKerral, p. 2; Gregory, p. 2].
mid-600s: Three groups (or kindreds) are in existence among the Dál Riadans (“although it is possible that the divisions among them [a]re not as clear cut as the sources might suggest”): the Cenél nOengusa (probably in Islay), Cenél nGabáin (occu- pying Kintyre, Cowal, Bute, and possibly Gigha, Jura, and Arran), and the Cenél Laoirn (Lorn, Ardnamurchan, Mull, Coll, and Tiree). The latter two are competing for supremacy by the beginning of the 8th century [Kingdom, p. 22; McKerral, pp. 2-3].
741: Chronicles record the “overthrow of Dál Riata” by the Picts [Kingdom, p. 23].
793: Irish annals mention “a series of Viking incursions into the Hebrides” [Grant/ Cheape, p. 12].
c. 80–1100: Viking raids, attacks, and settlement
Raids along the west coast of Scotland become “a seasonal occupation for the Vikings, and the raiders beg[i]n to make permanent settlements” [Grant/Cheape, p.
12]. Norse settlement begins in the mid 9th century “and appears to have been fairly extensive, especially around the sheltered harbours of the east coast” [Mc- Kerral, p. 2] Settlement after 880 is probably led by opponents of Haralt Harfager, who has established himself as king of all Norway and subjugated the petty kings there. These Norse settlers in Scotland begin harassing the Norwegian coast from Scotland as they had been harassing the Scottish coasts from Norway. After this, control of the Western isles goes back and forth between various Norse, and oc- casionally Irish, overlords [Gregory, p. 4].
c. 843: Scots & Picts merge: Kenneth mac Alpin, king of Dál Riada, becomes king of the Picts as well; this may have been legitimate succession (his mother was Pictish), but probably involved some degree of violence. Dál Riadic centres of power shift eastward, in part because of Viking pressure. However, “[t]he tenacity with which the connexion with Irish civilisation persist[s] in the Highlands [i]s an essential feature in the history of [Highland] culture. . . . . Until the seventeenth century, this Gaelic civilisation was common to all people between the Butt of Lewis and Cape Clear” [Grant/Cheape, p. 12; Gregory, pp. 2-3].
mid-9th C: emergence of the Gall-Gaidhil, “warriors of mixed blood” whose home- land is “almost certainly” the Hebrides; the Irish sources describe them as “Scots fostered by Norsemen” [Kingdom, p. 29; McKerral, p. 2]. “In view of their position as conquerors of alien origin, it is most significant that from the mid-ninth century, the annalists . . . begin to write of the Gall-Ghaidheal”, (‘Stranger Gaels’) [Grant/ Cheape, p. 13]. A “medieval Celtic-Scandinavian cultural province” emerges at this time from which “modern Gaelic Scotland is ultimately descended” [Marsden, p. x].
late 9th–10th C: emergence of individuals in the Hebrides and the Isle of Man bearing the title of ‘king’ or ‘lord’ of the Isles: “the extent and nature of this kingship [i]s fluid, and there c[an] be several kings in the region at once” [Kingdom, pp. 30–31; Greg- ory, p. 17]. Barrow points out that this “regular use of the title ‘king’ for the principal lords” is a “notably non-Scandinavian feature of the hybrid ruling class” of the Heb- rides [pp. 131-2].
1093: Kintyre, along with the Hebrides, ceded to Norway
1098: Magnus Bareleg, the Norse king, “invade[s] the West Highlands, and successfully consolidate[s] all the scattered Norse possessions under his rule”. Among the Gall-gaidhil chiefs expelled by the Norse king is one named Gillebride [McKerral, p. 4; Kingdom, p. 47], though it is possible that Gillebride’s lands were lost a few years earlier as a result of his support for Donald Bane in the struggle for succession which followed the death of Malcolm Canmore (1093) [Kingdom, ibid.; Gregory, pp. 11-12]. Of Gillebride we know little, “nor are we informed of the extent of his possessions, or where they lay, but they are believed to have been on the main- land of Argyle” [Gregory, p. 12]. A treaty in this year between Edgar, king of Scot- land, and Magnus Bareleg “confirm[s] Norwegian suzerainty over Man and all the islands of Scotland west of Kintyre and thence northward to Lewis” but the treaty “could only be important if the Norwegian crown had been able to enforce its auth- ority”. Instead, for most of the late 11th and early 12th century Norway is “torn by civil war and distracted by revolts (involving the northern isles)” [Barrow, p. 130].
1100s: In the early 12th century, “long-term changes . . . taking place on the western sea- board . . . cal[l] imperatively for the intervention of Scottish kings. . . . Norse politi- cal power in the western isles and Man weaken[s] steadily from the earlier dec- ades of [this] century. . . . Instead of the earls exercising strong rule in the name of the king of Norway, a turbulence verging on anarchy prevail[s] in the Hebrides and affect[s] the adjacent mainland. A warrior aristocracy quarrel[s] for ascendency not simply over the islands but also over broad tracts of territory that even the 1098 treaty would have allowed to be Scottish” [Barrow, pp. 130-1]. At this time, too, evidence indicates “a resurgence of Gaelic culture and an intensification of the old links with Ireland, a process contrasting sharply with what was happening in the east and in lowland Scotland” [ibid., p. 131]. Closely linked to both trends is the rise to prominence of Gillebride’s son Somerled.
1. Somerled: “The history of the west from the mid twelfth century to the first war of independence is largely the history of the House of Somerled. . . . His ancestors had somehow acquired, then lost and then, in his grandfather’s generation, re- gained a far-flung lordship of islands and mountainous mainland. . . . It is by no means certainly, however, that Somerled held all this wide territory unconditionally, as an unfettered vassal of the king of Norway for whatever was insular and of the king of Scots for the rest”. Evidence of this can be seen in the occasional attempts by Scottish kings to wrest some of the land from Somerled’s family by force. “In the isles, Somerled profit[s] from Norwegian weakness but f[inds] himself at log- gerheads with the rival royal line of Man” [Barrow, p. 133].
—“Somerled steps on to the stage . . . in the first half of the twelfth century . . . already a ruler of note in Argyll and the Isles. His early life, and rise to power, remain shrouded in mystery. . . .” [Kingdom, p. 39]. Indeed, “[i]t is from tradition alone . . . that any particulars of the early life of Somerled can be gathered; and it is obvious, that information derived from a source so liable to error, must be re- ceived with very great caution” [Gregory, pp. 9-11].
—”Although many claim he was of Scoto-Irish descent, others “have asserted that he was undoubtedly a Scandinavian by descent in the male line. His name is cer- tainly a Norse one; but on the other hand, the names of his father and grandfather are purely Celtic. . . . Somerled is mentioned more than once in the Norse Sagas, but never in such a way as to enable us to affirm, with certainty, what the opinion of the Scandinavian writers was as to his origin. . . . [T]he impression produced by the passages in which he is mentioned, is rather against his being considered a Norseman. It is possible, however” [Gregory, pp. 10-11]. Many historians have concluded that the pedigree that traces his descent back nine generations to God- frey, son of Fergus, “a chief of a tribe in Northern Ireland who came to Scotland to reinforce Kenneth mac Alpin” has been “proved to be substantially correct” [Grant/ Cheape, p. 60; Gregory, p. 11; Thomson, p. 270]. David Caldwell argues that DNA testing of the current chiefs of the Clan Donald, Clan Alasdair, and Clan Dougall, all direct descendants of Somerled, has turned up a paternal genetic marker that is almost certainly Norse [p. 34; see note 8]. But DNA testing has also traced Somerled’s ancestry to Colla Uais, a high king of Ireland historically tied to Dál Riada. “[E]vidently he belonged to the Gall-Ghaidheal, the mixed population of the Hebrides” [Grant/Cheape, p. 60]. Indeed, “Somerled’s Celtic-Norse extraction . . . is now widely accepted” [MacDonald, "Rebels . . .", p. 174; Sellar, p. 189]. John Marsden goes farther, saying “virtually everything that is known of or has been claimed for Somerled, even the most obviously apocryphal anecdotes found in the most doubtful sources, reflects some aspect of the characteristic fusion of Norse and Celt which binds the cultural roots of Gaeldom” [p. x].
—Whatever his ancestry, Somerled is credited with “dr[iving] out [the Norse] from Kintyre and other parts of Argyllshire” [McKerral, p. 4; Sykes, p. 213]: By 1130 he has retaken much of the western Highlands, and eventually he establishes a king- dom larger than that lost by his father [McAlister, “Somerled”; McKerral, p. 4]. Somerled is therefore at least partly responsible for the resurgence of Gaelic, which, having long before “superseded Pictish . . . [now] replace[s] Norse as the language of . . . the greater part of the Western Isles and a considerable portion of the Mainland” [Grant/Cheape, p. 11; Barrow, p. 131].
2. Development of the Highland clans
—“[B]y the twelfth century, the nuclei were forming in the Highlands of a wide type of organisation that was to develop gradually into what we now recognise as the Highland clan. The subject of the clans and their origins abounds with acute con- troversy. . . . However, . . . there comes a point about this time or during the suc- ceeding two centuries, when the ancestor, a man of some position who can often be identified, was able to found a family which had the power to survive. As the family grew over time, the degree of kinship to succeeding chiefs lessened and ties of adherence or dependence tended to take its place” [Grant/Cheape, p. 59].
—“The system was aristocratic in many respects. Certain family lines were highly esteemed, and there was a royal class. But it was not feudal. A clan claimed com- mon ancestry and kinship with the chief. Land belonged to no individual – certainly not to the chief – but to the whole clan. . . . All enmities, as well as all friendships, were collective” [MacLeod, pp. 43-4].
1140s: At some point in this decade Somerled marries Ragnhilde, daughter of Olaf, King of Man (1140 is the date usually cited, though there is no firm contemporary evi- dence for it) [Kingdom, p. 45; Stat. Acct.: Campbelton, p. 528; Barrow, p. 134]. Gregory suggests that Somerled’s rising power, and perhaps his interest in secur- ing for himself at least some of the Hebrides, concerned Olaf, who may have hoped that the marriage would neutralise this threat. R. A. MacDonald argues in- stead that Somerled’s choice of wife reveals an intentional alliance on his part with other dynasties along the Irish Sea instead of with the house of Canmore or any of the Anglo-Norman families [MacDonald, "Rebels . . .", p. 176]. In any case, this marriage is the first event in the life of Somerled for which we have authentic evi- dence [Gregory, p. 12]. From this union come the progenitors of several import- ant western clans, including the Clan Donald (and thence the MacAlasdairs). 
1143: birth of Ranald mac Somhairle [i.e., son of Somerled], according to some MacDonald genealogies. Ranald, or Reginald, is the second son of Somerled by Ragnhilde; at his father’s death he inherits Islay and Kintyre [Grant/Cheape, p. 61]. He is the only one of Somerled’s descendants known to have styled himself rex insularum. (Although it is possible Somerled himself used the title, none of his charters survives) [Sellar, p. 198]. Ranald’s descendants base themselves on Islay and are called the Lords of Islay [McKerral, p. 3].
1156–8: Somerled ousts the King of Man [Kingdom, p. 41; Keay, p. 890; Gregory, p. 14]. “The allegiance of all the Isles to Norway seems still to have been preserved" [Gregory, ibid.]. However, R. Andrew MacDonald reminds us that all of Somerled’s behaviour “must be placed firmly within an Irish Sea context, emphasising funda-mental dichotomies between the world in which [he] moved and the ‘new world order’ being introduced by the kings of Scots in the twelfth century.” Like Fergus of Galloway, he had “close connexions with the dynasty of Man and the Isles” and seems “to have followed a deliberate policy of forging links outside the Scottish kingdom with little or no regard for the kings of Scots”, who at this time are “align- ing themselves with European cultural models, which, among other things, em- phasised a hierarchy with room for only one king at its head” [MacDonald, "Reb-els . . . .", pp. 170, 174, 184-5]. But “Argyll and the Hebrides consistently refuse[e] to be governed by the kings of Scotland” [Sykes, p. 183].
1164: 1. death of Somerled and one of his sons (Gillebrigte) at the Battle of Renfrew: Somerled invades mainland Scotland [McKerral, p. 3; Sellar, p. 189]. He takes with him “a numerous army from Argyle, Ireland, and the Isles” and sails up the Clyde with 160 galleys [Gregory, p. 15; Bower, vol. 4, book VIII, chap. 6, pp. 263-5; Mac- Donald, "Rebels . . .", p. 169]. Somerled and his followers are, it is usually held, easily defeated. (The tradition that Somerled was assassinated before the battle, though now widely accepted, dates to the seventeenth century and may have no basis in fact [MacDonald, ibid., p. 169; Marsden, pp. 107, 110-1].) Though modern scholars have tended to see this as a grab for power on Somerled’s part, R. And- rew MacDonald demonstrates that all of the peripheral regions of Scotland were slowly being encroached upon by the feudal lordships erected by the Scottish kings; Fergus of Galloway had been defeated and, although not imprisoned, re- quired to live out his life in Edinburgh where the king could keep an eye on him. In this context, Somerled’s move might well have been defensive in nature. (The writers of Scottish chronicles, from whom we take much of what we know about this period, were under the patronage of the Scottish king and church; the fact that they considered Somerled et al. to be rebelling against their rightful loyalties to the Scottish king [e.g., Bower, vol. 5, book VIII, pp. 263] does not necessarily mean that this was the truth of the situation.) [MacDonald, "Rebels . . .", pp. 181-2]. Som- erled’s descendants “still ke[ep] the possession [of the Isles and Kintyre], exer-
cis[e] the power, and often assum[e] the title of kings” [Stat. Acct.: Campbelton, p. 529; NSA: Saddell & Skipness, p. 442].
2. On the death of Somerled “his four surviving sons divid[e] the estate between them” [Barrow, p. 133]. “Precise evidence is lacking as to who got what, and there is no reason to think that the initial division remained static as the brothers fought among themselves” for the territories left by their father [Caldwell, p. 35; Sellar, p. 195].
c. 1190: Birth of Dòmhnall [Donald] mac Ranald, may have occurred in this year. Don-ald and his heirs h[o]ld the lordship of Islay [Barrow, p. 134]. About him little is act-ually known; some of the detail given in Hugh MacDonald’s history is “evidently wrong. . . . Of the rest . . . there is nothing in early accounts to offer support" [Caldwell, p. 40]. Barrow calls him “an obscure individual” but one who “must hold an undisputed place in Scottish hearts and in the story of Scots the world over” because of his role as founder of the Clan Donald, one of the two oldest Highland clans [p. 134; Grant/Cheape, p. 37] and certainly one of the most important.
1192: “[T]he Chronicle of Man mentions a battle between Reginald [Ranald] and Angus, in which the latter obtain[s] victory” [Gregory, p. 17; Caldwell, p. 37; Sellar, p. 195].