1911 Encyclopædia Britannica, Volume 24… (1911)
“ The eldest of his ten children was Edward Seymour, 1st duke of Somerset (q.v.) , the famous Protector in the reign of Edward VI.; his third son was Thomas Seymour, Baron Seymour of Sudeley (q.v.) ; and his eldest daughter Jane was third wife of King Henry VIII., and mother of Edward VI. The Protector was twice married; and, probably owing to the adultery of his first wife whom he repudiated about 1535, his titles and estates were entailed first on the issue of his second marriage with Anne, daughter of Sir Edward Stanhope. (See Somerset, Earls and Dukes of.) ”
