Joan de Munchensi Welsh noble (1230–1307) Parents Joan Marshal Warin de Munchensy Children William de Valence John de Valence Margaret de Valence Aymer de Valence, 2nd Earl of Pembroke Joan de Valence Agnes de Valence Isabel de Valence Isabel (2) ferch William de Valence Elizabeth de Comyn Partners William de Valence, 1st Earl of Pembroke