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In page Margaret de Clare, Baroness Badlesmere:

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Margaret was born at Bunratty Castle in County Clare, Ireland, circa 1 April 1287, the youngest child of Thomas de Clare, Lord of Thomond and Juliana FitzGerald of Offaly, and was a granddaughter of Richard de Clare, Earl of Hertford and Gloucester. She had two brothers, Gilbert de Clare, Lord of Thomond, and Richard de Clare, 1st Lord Clare, Lord of Thomond, who was killed at the Battle of Dysert O'Dea in 1318;[1] and an elder sister, Maud, whose first husband was Robert de Clifford, 1st Baron de Clifford. Margaret had an illegitimate half-brother, Richard.[citation needed]