 According to Angus and Archibald Macdonald, Ùisdean's expedition took place around 1460, when he did not appear to hold title to any of the lands his family who come to hold.In fact, in the year 1463, Eoin II, Lord of the Isles granted Ùisdean's older brother, Celestine, the 28 merklands of Sleat, in addition to extensive lands in west Ross given to him in the previous year.In 1469, Ùisdean received from the Earl of Ross the 30 merklands of Skeirhough in South Uist; the 12 merklands of Benbecula, and the merkland of Gergryminis also in Benbecula; the 2 merklands of Scolpig, the 4 merklands of Tallowmartin, the 6 merklands of Orinsay, the half merkland of Wanlis, all in North Uist; and also the 28 merklands of Sleat.