Born and bred in Scotland, by 1611 he had moved to Ireland with his Scottish wife to occupy his plantation grant.
In 1630 he married his second wife and moved to Roscrea in southern Ireland, which his father-in-law, the 11th Earl of Ormond, leased to him in lieu of dowry.
George was born between 1575 and 1590,[b] probably at Paisley in Renfrewshire in the west of Scotland, the fourth son of Claud Hamilton and his wife Margaret Seton.
[1][2] His paternal grandfather (died 1575) had been the 2nd Earl of Arran in the Peerage of Scotland and Duke of Châtellerault in the Kingdom of France.
His father's family descended from Walter FitzGilbert, the founder of the House of Hamilton,[3] who had received the barony of Cadzow from Robert the Bruce in the 14th century.
Their marriage date is constrained by her first husband's death in October 1602 and a document of 1609 that mentions her as Hamilton's wife.
[27] Jointly with Sir William Stewart, Hamilton owned a middle proportion called Terremurearth, Tirenemurtagh, or Moynterlemy that had in 1611 belonged to a certain James Hayg.
[30] However, Ormond had difficulties to pay and in 1631 he agreed to let Hamilton enjoy the manor, castle, town, and lands of Roscrea for a duration of 21 years as a part payment of the dowry.
[31] George and Mary had an only surviving child:[32] On 5 June 1646 Owen Roe O'Neil with the Confederate Ulster army defeated the Covenanters under Robert Monro in the Battle of Benburb.
[39][40] On 18 September, Rinuccini overturned the Confederate government in a coup d'état[41] with help of the Ulster Army, which Owen Roe O'Neill had marched to Leinster.