William de Montferrat Marquis de Montferrat [11408] ²⁴

  General Notes:

http://www.hull.ac.uk/php/cssbct/cgi-bin/gedlkup.php/n=royal?royal12974

William married Isabel de Clare [11407] [MRIN: 5158], daughter of Richard of Gloucester de Clare 2nd Earl of Gloucester [10458] and Maude de Lacy [10459], in Jun 1257 in Lyons. (Isabel de Clare [11407] was born in May 1240 and died about 1271.)