Thomas Andrew Archer, Dictionary of National Biography… (1887)
“ By his wife Maud, Gloucester had several children, of whom the most noteworthy were (1) his successor Gilbert (the 'Red') [q. v.] , (2) Thomas de Clare, the friend of Prince Edward (d. 1287) , (3) Boso or Bono the good, a canon of York. Of his daughters, Margaret married Edmund, a younger son of Richard, earl of Cornwall, and Roesia married Roger Mowbray in 1270 (Land of Morgan, pp. 141-2; Pat. Rolls, 31 a) . Gloucester was the most powerful English noble of his time. ”
