Hertford, William Seymour, 1st marquess and 2d earl of
Hertford, William Seymour,
1st marquess and 2d earl of här´fərd, härt´– [key], 1588–1660, English nobleman; great-grandson of Edward Seymour, duke of Somerset , and grandson of Lady Catherine Grey, through whom he had a claim to the throne. His secret marriage (1610) to Arabella Stuart , cousin of James I, enraged the king, and he was imprisoned. He escaped and fled the country, but returned in 1616 after Arabella's death. Made a privy councillor (1640) and marquess of Hertford (1640), he fought for Charles I in the civil war. He received his ancestor's dukedom of Somerset at the Restoration (1660).
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