Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "John Devereus (Devereux)...Burton and Craneford. Certain lands &c. held for life only of the inheritance of Gerard son of William de Eyllesford, with remainder to the said Gerard and his heirs, of the heirs of Gerard de Fornyval by service of an ounce of silk or 12d. yearly."Dated: 1316. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol5/pp361-372. Reference: C 134/46/20 (Data from secondary evidence)