Zij is getrouwd met Thomas II "The Wise" 1st Baron de Berkeley.
Zij zijn getrouwd in het jaar 1267, zij was toen 19 jaar oud.Bronnen 2, 3
Kind(eren):
Joan Ferrers, d. 19 Mar 1309/10; m. 1267 Sir Thomas de Berkeley, b. 1245, d. 23 July 1321, son of Maurice de Berkeley, b. 1218, d. 1281, and Isabel, daughter of Richard Fitz Roy, bastard son of King John of England. [Magna Charta Sureties]ter and coheir of Roger (DE QUINCI), EARL OF WINCHESTER. She died in March 1309/10, and was buried at St. Augustine's, Bristol. He died 23 July 1321, at Berkeley, aged about 76. [Complete Peerage II:127-8, (transcribed by Dave Utzinger)]