John of Oxford

Called by Becket  'usurper' of the deanship of Salisbury

While it was unlikely that he was personally responsible for the drafting of the Constitutions of Clarendon, it seems very likely that he was one of a group responsible for commissioned by Henry II to delineate the ecclesiastical customs od his grandfather's reign.


Council and Synods Part I Volume II 
Dorothy Whitelock; M. Brett; Christopher Nugent Lawrence Brooke; Frederick Maurice Powicke (1981). Councils & Synods, with Other Documents Relating to the English Church: A.D. 871-1204. I. Part I Volume II. Clarendon Press. pp. 852, 877.ISBN 978-0-19-822394-8.

While it was unlikely that he was personally responsible for the drafting of the Constitutions of Clarendon [In MTB 195 and 196/CTB 79 and 80 Becket blames Richard de Lucy and Jocelin de Balliol for this] 

However, it seems very likely that he was one of a group responsible for commissioned by Henry II to delineate the ecclesiastical customs od his grandfather's reign.

[but in the same letter to the Pope he names John of Oxford as excommunicate for communicating with the schismatic Reinald of Cologne and for usurpation of the deanery of Salisbury.]  

References

John of Oxford - Wikipedia

John of Oxford - DNB

Oxford, John of (DNB00) - Wikisource

Deans Fasti Ecclesiae Anglicanae 1066-1300 volume 4 (pp. 7-12)

NORWICH - Bishops (originally of Elmham and Thetford) Fasti Ecclesiae Anglicanae 1066-1300 volume 2 (pp. 55-58)

Michael J. Franklin (1995). "Christopher Harper-Bill: John of Oxford, diplomat and bishop". Medieval Ecclesiastical Studies: In Honour of Dorothy M. Owen. Boydell & Brewer Ltd. pp. 83–105. ISBN 978-0-85115-384-1.