Petrus

According to the Old English Dictionary:

Petrus

gen. Petres; m. The apostle Peter :-- Ðá genam Petrus hyne ... Ðá beseah hé hyne and cwæþ tó Petre, Mt. Kmbl. 16, 22-23. Se Hǽlend com on Petres húse, 8, 14. Hé sceare (Petres mearce, MS. B.) onféng, Bd. 3, 18; S. 546, 10. Be Peteres mæssan, Wulfst. 272, 9. petrus