REF " A Baronial Family in Medieval England: The Clares, 1217-1314"
by Michael Altschul, Johns Hopkins Press, 1965, concerning the partition of the de Clare estates after the death of the last Gilbert, p 170-171: Rogery Damory and Elizabeth took the bulk of the honor of Clare in East Anglia, including the castle and manor of Clare and the pleas of the honor court, as well as Cranbourne and the other Dorset manors and boroughs. In addition, each heir acquired two-ninths of the liberty of Kilkenny in Ireland, although there is no evidence that any of them every visited it. (P) The death of the countess in the summer of 1320 completed the division of the estates among th heirs. Maud probably died on July 2, and the properties she held in dower must have been partitioned shortly thereafter. Each received an equal portion of her third of Kilkenny. Damory's share was the now unified lordship of Usk=Caerleon, with Edelegan and Llefnydd. The partition of the Clare estates has been described as "the most important territorial upheaval of the reign." [Denham-Young *Vita Edwardi Secundi, pp xii-xiii*]"
From same, regarding Roger's death: p. 173: "Less than a year later, the Despensers themselves returned in triumph. The king managed to win over to his side many of Lancaster's allies, and fighting again broke out, culminating in the royalist victory at Boroughbridge on March 22, 1322. Lancaster and his chief supporters, including Roger Damory and Bartholomew de Badlesmere, were executed, while D'Audley and the Mortimers were imprisoned."