William Sinclair (nobleman, † after 1358)

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Sir William Sinclair of Roslin (also William St. Clair ) († after 1358) was a Scottish nobleman.

William Sinclair came from the Scottish Sinclair family . He was the eldest son of William Sinclair . He was still a minor when his father set out with James Douglas to transfer the heart of King Robert I to the Holy Land . His father was killed in action against the Moors in Spain in 1330. After the death of his grandfather Henry Sinclair , who died around 1330, the young William became heir to the Barony of Roslin in Midlothian and other possessions in central and southern Scotland.

Sinclair married Isabelle Strathearn , the eldest daughter of Malise, 8th Earl of Strathearn from his second marriage to Marjorie . Malise's only son was murdered in 1344, and when Malise died around 1350, Isabelle and her four sisters became one of her father's heiresses. The division of the inheritance was made more difficult by the fact that the daughters came from two marriages and because a different inheritance law applied in the Scottish Caithness than in the Scandinavian Orkney . Therefore, Sinclair's eldest son Henry Sinclair († 1400) received part of his grandfather's estate in Malise.

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