William De Roos Baron Roos, Of Belvoir III

Baron Roos Side

• Baron Roos, Robert De Roos Of Belvoir IV Abt 1223 - 1285  (62 years)

• De Roos, William I Of Hamlake 1193 - Abt 1264  (72 years)
• Fitzpiers, Lucia Of Brecknock Abt 1196 - Aft 1266  (> 71 years)

• De Roos, Robert "Furfan" 1173 - Bef 1226  (< 56 years)
• Avenal, Isabella Of Scotland Abt 1165 - Yes, date unknown
• Fitzherbert, Piers - 1235
• Fitzrobert, Alice De Warkworth - Bef 1225

De Albini Side

• De Albini, Isabel Abt 1223 - 1301  (78 years)

• Lord Belvoir, William De Albini - 1247
• Biseth, Albreda

• Earl Of Arundel, William De Albini V 1165 - Bef 1221  (< 56 years)
• Le Meschines, Matilda (Mabel) Of Chester 1171 - 1233  (62 years)
• Lord Biseth, Henry Biseth