namely Colla Uais and Conn of the Hundred Battles. Thus Clan Donald claimed to be both Clann Cholla and Siol Chuinn (Children of Colla and Seed of Conn). Possibly the oldest piece of poetry attributed to the MacDonalds is a brosnachadh (an incitement to battle) which was said to have been written in 1411, on the day of the Battle of Harlaw. The first lines of the poem begin "A Chlanna Cuinn cuimhnichibh / Cruas an àm na h-iorghaile," (Ye children of Conn remember hardihood in the time of battle). A later poem made to John of Islay (1434–1503), last of the MacDonald Lords of the Isles, proclaims "Ceannas Ghàidheal do Chlainn Cholla, còir fhògradh," (The Headship of the Gael to the family of Colla, it is right to proclaim it), giving MacDonald's genealogy back to Colla Uais. However, a recent DNA study has shown that Somerled was of Norse descent in his male line. By testing the Y-DNA of males bearing the surnames MacDonald, MacDougall, MacAlister, and their variants it was found that a substantial proportion of men tested shared the same Y-DNA and a direct paternal ancestor. This distinct Y-chromosome R1a1 haplotype found in Scotland has been regarded as often showing Norse descent in the Britain and Ireland. Scottish-Norwegian War In 1263 Alexander III of Scotland defeated Haakon IV of Norway at the Battle of Largs. The Clan Donald chief, Aonghas Mor and his clan had technically been vassals of Haakon and so the king of Scots became their new overlord, as confirmed in the Treaty of Perth. Wars of Scottish Independence Aongus Mor's son was Aonghus Óg of Islay who supported Robert the Bruce at the Battle of Bannockburn in 1314. In recognition of Clan Donald's support King Robert the Bruce proclaimed that Clan Donald would always occupy the honoured position on the right wing of the Scottish army. 15th to 16th centuries Succession to the Earldom of Ross The title and territory of the Earl of Ross had originally been held by the Chief of Clan Ross but had passed through an heiress to the Leslie or Lesley family in the early 15th century. However, Angus Og's grandson, Donald of Islay, Lord of the Isles married Mariota, Countess of Ross (Margaret Lesley) who was the heiress of the Leslie Earls of Ross and he later claimed the position of Earl of Ross through this marriage. In