Gilbert de Clare, 8th Earl of Gloucester 14th-century English magnate (1291–1314) Parents Joan of Acre Gilbert de Clare, 7th Earl of Gloucester Children John de Clare Siblings Margaret de Clare Elizabeth de Clare Eleanor de Clare Mary de Monthermer Thomas de Monthermer, 2nd Baron de Monthermer Joan de Clare Edward de Monthermer, 3rd Baron Monthermer Joan de Monthermer Isabel de Clare Partners Maud de Burgh