Notes Weis" "Ancestral Roots. . ." (54:33), (65:33), (65A:33), (79:31). Cokayne's "Complete Peerage" , (Badlesmere, p.372). She was the widow of Gilbert de Umfreville when she married BARTHOLOMEW. She was one of the daughters and co-heiresses of THOMAS DE CLARE. She was notorious for having refused the Queen admission to the Royal castle at Leeds in 1321. After her husband's execution, she continued as a prisoner in the Tower until, through the influence of WILLIAM DE ROS, of Hamlake (her son-in-law), and others, she obtained her freedom. Whereupon she went to the nunnery of Minoresses, outside of Adgate, in the suburbs of London. She had 2 shillings a day for her maintenance, to be paid by the sheriff of Essex; she subsequently, however, obtained a large proportion of the deceased lords' manors as her dowry.

The Battle of Dysart O'Dea 1318
Richard de Clare led an expedition against Conor O'Dea and his clan of Dysart O'Dea, who were faithful supporters of Muirceartach and the clan Turlough. Conor O'Dea called upon his neighbouring clans under Felim O'Connor and Loughlin O'Hehir to assist him (Muirceartach was in East Clare at the time). On the tenth of May 1318, Richard de Clare and a strong force of Normans, with the support of the sons of Mahon O'Briain and Brian O'Brian a brother of the late King Donogh, approached O'Dea's territory. Confidently, de Clare divided his force into three sections. With an inferior force in men and arms O'Dea's strategy was to set up a trap for de Clare at the ford of Ballycullen near Dysart O'Dea. Richard de Clare at the head of his section raced across the ford after some of O'Dea's men acting as decoys. Then Conor O'Dea and his army came out of hiding and cut off de Clare's retreat. Richard de Clare was killed along with most of his section. The remainder of de Clare's army forced a crossing of the ford and surrounded O'Dea's army, which retreated towards a wood. Then Felim O'Connor's and Loughlen O'Hehir's men joined the battle giving some relief to O'Dea's men. Still the issue was in doubt until late in the day, Muirceartach O'Briain unexpectedly arrived at the battle scene and routed the remnants of de Clare's army pursuing them as far as Bunratty. Thus Norman power in Thomond was violently ended thanks mainly to Conor O'Dea and his neighbouring clans.
Upon hearing of the death of her husband and most of his army, de Clare's widow hastily abandoned Bunratty to government control and fled to England with her only son, then a minor. Young Thomas de Clare, the last male representative of his family died in 1321. The de Clare properties in Thomond, now lost to O'Brian control (except Bunratty Castle), were divided between his aunts Matilda, wife of Robert de Welles and Margaret, wife of Bartholemew de Baddlesmere - both wealthy English landowners who did not pursue their seemingly hopeless claims in such a troublesome area as Thomond.