 Beatriz ,Alfonsa Princesa de Castilla Y Leon, daughter of Alfonso X "El Sabio" Rey de Castilla and Violante (Yolande) of Aragon.Born Dec 1254 at of Sevilla,Castile and LÃon,Spain, died after 1280, at least 26 years Married 1271 (at least 9 years married) to:  Guglielmo di VII, Marchese of Montferrat Montferrato, son of Bonifacio III De Montferrat and Margherita Countess of Savoy.Born ± 1236 at of Monferrato,Piemonte,Italy, died Feb 6, 1292 at Alexandria,Al Iskandariyah,Egypt, approximately 56 years, 1st marriage to: Beatriz ,Alfonsa Princesa de Castilla Y Leon, 2nd marriage to: Isabel de Clare Children: 1. Yolanda Irene di MontferratoBorn ± 1274 at of Saloniki,Makedhonia,Greece, died ± 1317 at Drama, approximately 43 years, buried at Pantokrator Cloister,Constantinople,Istanbul,Turkey Source: lorenfamily.com 2. Giovanni di , Marquis of Montferrat MontferratoBorn ± 1292 at of Sevilla,Castile and LÃon,Spain, died Mar 9, 1305, approximately 13 years | |||