Elizabeth is thought to be the oldest of their children. She is likely the Elizabeth Chaucer who, along with a Margaret Swynford, was nominated a nun by royal privilege at the accession of Richard II in 1377, thus she may have been born as early as 1364. She may have been a nun in Barking Abbey; there are records of an "Elizabeth Chausier" and her nickname being "Chaucy" which leads historians to believe that she was their daughter. It has been suggested that she was named after Elizabeth of Ulster, however it is worth remembering that Philippa had an elder sister, named Elizabeth/Isabel.