I will not weigh in on sanctity or lack of sanctity among those who do not confess the Holy Orthodox Faith. (Though personally, I'd be willing to let the Latins keep Theresa of Avila if we ever get back together: some of her more outrageous statements (e.g. "Life in this world is like a night in a second rate inn") remind me of the Desert Fathers.)
I will, however, note, that in the Synaxarion prepared by Simonas Petras Monastery on the Holy Mountain (not available in English, but translated into French as Le Synaxaire), the year 800 was chosen as the cut-off for
consideration of saints form the now-separated Partiarchate of Rome.
"the year 800 was chosen [at Simonas Petras] as the cut-off for consideration of saints form the now-separated Partiarchate of Rome."
Makes sense to me.
On the other hand, ROCOR gives England an extension to the Battle of Hastings (A.D. 1066), which allows for the appearance of Our Lady at Walsingham and for St. Edward the Confessor.
Should not Spain and Portugal should be cut off at A.D. 589, the date of the Council of Toledo?
Actually, September through April (in 4 volumes) of the Synaxarion prepared by Simonas Petras Monastery is indeed available in an English translation/edition. There is additional material that has been added for later saints, etc...
It is a beautiful work, well worth the money, and I can't wait for additional volumes to be published. The introductory material is also wonderful.