Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "Bartholomew de Burgherssh the elder...He died on 3 August last...Bartholomew de Burgherssh his son, aged 26 years, is his heir...He died on Sunday after St. Peter’s Chains last...He died on Wednesday before St. Peter’s Chains last...Bartholomew de Burgherssh, knight, his son, aged 30 years as they understand, is his heir...The manor held jointly with Elizabeth his wife"Dated: 1355. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol10/pp209-228. Reference: C 135/131/8 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "Theobald de Verdon alias de Verdun...Elizabeth late his wife is pregnant of a living child. His daughters, Joan aged 13, Elizabeth aged 10, and Margery aged 7, are his next heirs...Joan aged 14, Elizabeth 12, and Margery 5 years."Dated: 30 July 1316. External Link
http://www.british-history.ac.uk/inquis-post-mortem/vol6/pp35-44. Reference: C 134/56/1 (Data from secondary evidence)
3) Source: Special Collections: Ancient Petitions "Edward le Despenser, knight... Despenser requests that he be granted livery of his lands and issues of Killoteran which are in right of his wife... Elizabeth [le Despenser], wife of the petitioner, and daughter of Bartholomew de Burgherssh; Bartholomew de Burwasshe (Burghersshe)." Date: 1373. External Link
https://discovery.nationalarchives.gov.uk/details/r/C9334858. Reference: SC 8/226/11298 (Data from direct source)