score:4
The National Library of Australia (of all places) has an electronic version of an 1884 publication from the Oxford Historical Society, entitled "Old Plans of Oxford". It includes Agas' 1578 map of Oxford (mentioned by sempaiscuba in the comments), on which Canterbury College can be found. Here's an extract from Panel II:
This appears to be approximately here on Google Maps:
Note that South appears to be at the top of Agas's map.
Upvote:1
Well, kind of embarrassing, but the original Wikipedia article was correct, because the full phrase is:
The Priory first sent 4 monks to study in Oxford in 1311, in a hall it had bought there near the church of St. Peter-in-the-East, but the actual college was founded in 1362 by Simon Islip, archbishop of Canterbury, in the parish of St. Edward.
After looking for such parish, I found this website, which has this nice map of Oxford, allegedly from AD 1375 (hiqh quality here):
It is possible to see there that number 7 is the parish of St. Edward, referred in the article. The college can also be seen where now is Christ Church college.