William Sinclair, 1st Earl of Caithness, last Earl of Orkney, 2nd Lord Sinclair and 11th Baron of Roslin was a Norwegian and Scottish nobleman and the builder of Rosslyn Chapel, in Midlothian. Wikipedia
Born: 1410, Caithness, United Kingdom
Died: 1480 (age 70 years), Kirkcaldy, United Kingdom
Spouse: Marjory Sutherland (m. 1456) and Janet Yeman (m. ?–1480)
Grandchildren: John Sinclair, 3rd Earl of Caithness, Henry Sinclair, William Leslie, 3rd Earl of Rothes, and more
Parents: Egidia Douglas
Great-grandparents: Euphemia de Ross and Archibald Douglas, 3rd Earl of Douglas