1911 Encyclopædia Britannica, Volume 12… (1911)
“ His father was George Hamilton, younger brother of James, 2nd earl of Abercorn, and head of the family of Hamilton in the peerage of Scotland, and 6th duke of Châtellerault in the peerage of France; and his mother was Mary Butler, sister of the 1st duke of Ormonde. According to some authorities he was born at Drogheda, but according to the London edition of his works in 1811 his birthplace was Roscrea, Tipperary. ”
