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Edmund Beaufort, 2nd Duke of Somerset married before 1436 probably, abt 1425, Lady Eleanor Beauchamp, widow of Thomas de Ros, 9th Baron de Ros, daughter of Richard de Beauchamp, 13th Earl of Warwick and his first wife, Elizabeth de Berkeley, daughter and heiress of Thomas de Berkeley, 5th Baron Berkeley and Margaret de Lisle, 3rd Baroness Lisle.
He submitted himself to Edward (the former Earl of March, now King) in April 1461, and by the end of June, Booth was beating back a raid led by the Lords Ros, Dacre and Rugemont-Grey who brought Henry VI over the border to try to raise a rebellion in the north of England.
Thomas de Ros, 4th Baron de Ros of Helmsley (1338 – 8 June 1383) was the son of William de Ros, 2nd Baron de Ros, and the brother of William de Ros, 3rd Baron de Ros.