|William Keith, 3rd Earl Marischal|
Elizabeth Beatrice Douglas
William Keith, 4th Earl Marischal
|Alexander Keith of Troup|
± 1536-± 1585
± 1552-> 1600
Hij is getrouwd met Margaret Keith op 30 juni 1538 te Inverurie-Aberdeenshire, Scotland, hij was toen 31 jaar oud.
William, 4th Earl Marischal was one of the guardians of Mary Queen of Scots during her minority, and was a member of her privy council on her return to Scotland. While refraining from extreme partisanship, he was an adherent of the Reformation.
His contributions to the Keith fortunes came from his marriage to Margaret, daughter and heiress of Sir William Keith of Inverugie. This marriage nearly doubled the family lands, reaching into seven shires: Haddington, Linlithgow, Kincardine, Aberdeen, Banff, Elgin and Caithness. His estates lay in so many counties that he could travel from Berwick to John o Groats eating every meal and sleeping every night on his own lands.
The Earl was reputed to be the wealthiest man in Scotland at one time, but his extravagant lifestyle began to diminish the familys estate. Upon this realization, William retired to a private life at Dunnottar Castle in 1567. This self-imposed incarceration lasted for over seventeen years, until all the debts were cleared, and earned him the moniker "William of the Tower".
William was succeeded by his grandson George Keith.