Mordaunt, John, first Viscount Mordaunt of Avalon (1626-1675), royalist conspirator, was born on 18 June and baptized on 20 June 1626 at Lowick, Northamptonshire, the second son of John Mordaunt, fifth Baron Mordaunt and later first earl of Peterborough (bap. 1599, d. 1643) [see under Mordaunt, Henry], and his wife, Elizabeth (1603-1671), daughter of William, first Baron Howard of Effingham. He was educated privately in France and Italy and it is unclear when he returned from the continent. However, he was in England by July 1648 when he joined his elder brother Henry Mordaunt, second earl of Peterborough, in a royalist uprising. John raised 200 horsemen for the king, but the rising failed and he, along with his brother, fled into exile, staying for a time at The Hague.
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