If one checks the Wikipedia entry on Cyril of Alexandria, there is no indication that he is venerated as a Saint in the Roman Catholic Church. But, although it is not indicated there, I am under the impression that (somehow) he is venerated as a Saint in the Byzantine Catholic Church, one of the 23 Eastern rites in full communion with Rome.
But, of course, (Saint) Cyril of Alexandria has been declared one of the thirty-six doctors of the Roman Catholic Church. See, for instance, the chronological list of the doctors of the church.
QUESTION: Has (Saint) Cyril of Alexandria ever been canonized (or officially recognized as a Saint) by the Roman Catholic Church? If not, how is it possible that he was proclaimed a Doctor of the Church by Pope Leo XIII in 1882?