 The Macdonalds of Sleat descend from Ùisdean, bastard son of Alasdair of Islay and the daughter of Ó Beólláin (O'Beolan), Abbot of Applecross.From Ùisdean, the Macdonalds of Sleat are also known in Gaelic as "Clann Ùisdein" ("the children of Ùisdein").The first record of Ùisdean occur in the traditional histories of the shenachie MacVurich and Hugh Macdonald.