Uilleam III Mormaer of Ross 2
- Born: About 1315
- Marriage (1): UNKNOWN,
- Marriage (2): MACDONALD, Mary
- Marriage (3): Isabella of Strathearn on 28 May 1344 1
- Died: 1372
Other names for Uilleam were William 5th Earl of Ross 3 and O'BEOLAN, William 5th Earl of Ross, Lord of Skye.1
"William, on the other hand, the last O'Beolan Earl of Ross, who as a "Royal" Ross bore the Three Lions Rampant Argent of Ross within a "Royal Tressure" (similar to the Royal Arms) on the breast of the Buchan Red Spread Eagle (Comyn heiress) had had lands literally all over Scotland: in the Isles, in Buchan (Aberdeenshire), if Fife and even in Atholl, where Sir John de Cardney, his natural son, would eventually settle, or be settled, at Cardney....
William had always worked closely with the Stewart, and had, successfully joined his cousin the then Steward of Scotland (later Robert II) at the siege of Perth in 1339.
William was acting in self-interest, understandable when considered that the Stewart of Scotland was himself in the process of inheriting the throne of Scotland by a Bruce heiress, the Bruce male line indeed failing in David II. And in spite of being sons and grandsons of the Earl of Ross, the first Cairneys played our their private and public dramas in the Royal Stewart Household, being of no danger because of their illegitimate (natural) status in their connection to William, who had never quarreled with his Royal Stewart kinsmen."
from Notes in Macfarlane entry for William O'Beolan, 5th Earl of Ross, Lord of Skye 1
Uilleam married UNKNOWN.
Uilleam next married Mary MACDONALD. (Mary MACDONALD was born about 1315.)
Uilleam next married Isabella of Strathearn, daughter of Malise V 8th Earl of Strathearn and Marjory, on 28 May 1344.1 (Isabella of Strathearn was born about 1326.)