1911 Encyclopædia Britannica, Volume 12… (1911)
“ Guise remained at the court of Blois after receiving repeated warnings that Henry meditated treason. On the 25th of December he was summoned to the king’s chamber during a sitting of the royal council, and was murdered by assassins carefully posted by Henry III. himself. The cardinal of Lorraine was murdered in prison on the next day. The history of the Guises thenceforward centres in the duke of Mayenne (q.v.) . By his wife, Catherine of Cleves, the third duke had fourteen children: among them Charles, 4th duke of Guise (1571–1640) ”
