Just a few weeks later after Isabel's birth, Edward II married Elizabeth to Sir Roger D'Amory, Lord D'Amory, Baron of Amory in Ireland. D'Amory had been a knight in her brother's service who rose to prominence as a favourite of Edward II. Now married to him, Elizabeth was caught up in the political upheavals of her uncle's reign. She gave birth to another daughter, Elizabeth, in May 1318. Roger was reckless and violent, and made a deadly enemy of his brother-in-law, Hugh Despenser the younger. D'Amory switched sides, joining the Marcher Lords led by Roger Mortimer and Thomas, Earl of Lancaster in the rebellion known as the Despenser War. He died of his wounds at Tutbury Castle, Staffordshire after 16 March 1322, having been captured by the royalist forces at the Battle of Boroughbridge where the rebels were soundly defeated. Elizabeth was captured at Usk Castle and imprisoned at Barking Abbey with her children by the victorious faction.