Lord Willem Hay 1st Earl of Errol, 2nd Lord Hay, Constable of Scotland 1
- Born: 1423, Errol, Perth and Kinross, Scotland
- Marriage (1): Beatrice Douglas Countess of Errol in Perth, Perthshire, Scotland
- Died: 15 Nov 1461, New Slains Castle, Buchan, Aberdeenshire, Scotland at age 38
Willem married Beatrice Douglas Countess of Errol, daughter of James Douglas 7th Earl of Douglas and 1st Earl of Avondale and Beatrice Sinclair, in Perth, Perthshire, Scotland. (Beatrice Douglas Countess of Errol was born in 1428 in Douglas, Lanarkshire, Scotland and died in 1490 in Huntly, Aberdeenshire, Scotland.)
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