Sources

1) Source: Special Collections: Ancient Petitions "John de Roos and Margaret his wife, daughter [?recte granddaughter - see C134/6/12] and heir of Peter de Goushull, state that after Peter's death the Earl of Lincoln seized certain tenements in Swinefleet, in name of wardship, during Margaret's minority." Date: 1322-1327. External Link
https://discovery.nationalarchives.gov.uk/details/r/C9107177. Reference: SC 8/69/3406 (Data from secondary evidence)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "PHILIP LE DESPENSER... All held, as of the honour of Albemarle, by knight’s service, of the inheritance of Margaret de Gousill late the wife of the said Philip, and daughter and heir of Ralph de Gousill, and she was 17 on the day of St James last: he had nothing otherwise in those tenements...Philip his son, born on 6 April last, is his next heir... Goushill. (Two parts of the manor?) (extent given), held by the said Philip and Margaret, as of her [inheritance], of the barony of Bayeux." Date: 1313. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol5/pp262-275. Reference: C 134/34/5 (Data from direct source)