|John du Plessis
John du Plessis 1406
Favoured by Henry III, who in 1247 created him the Seventh Earl of Warwick and subsequently Count of Warwick. The estates passed to Margaret's cousin, William Maudit. 1408
John married Margaret de Newburgh, 7th Countess of Warwick, daughter of Henry de Newburgh, 5th Earl of Warwick and Margery d'Oilly.