John, sprang three great Lincolnshire families: I. Bek of Eresby, II.
From Henry Bek, lord of Eresby, was descended, about the middle of the thirteenth century, Walter Bek, who had three sons: (1) John, lord of Eresby, from whose daughter the Lords Willoughby de Eresby claimed their descent, as they obtained from her their barony; (2) Thomas (d. 1293 ), who became bishop of St. David's in 1280, (3) Antony, the third son (d. 1310), who became bishop of Durham in 1283.
From Bek of Luceby sprang another Walter, who was constable of Lincoln Castle at the time when his kinsmen Thomas I and Antony I were respectively bishops of St. David's and Durham, and died 25 August 1291.
The three sons were all underage at the date of their father's death, and probably became wards of their kinsman Antony I, the great bishop of Durham.
[The chief authority for the Beks is the MS. Harl, 3720, from the fourteenth century, and appears to have been drawn up as a family chronicle sometime in the reign of Edward III.