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In Roman Catholicism, a Doctor of the Church (Latin doctor, teacher, from Latin docere, to teach) is a saint from whose writings the whole Christian Church is held to have derived great advantage and to whom "eminent learning" and "great sanctity" have been attributed by a proclamation of a pope or of an ecumenical council. This honor is given rarely, only posthumously, and only after canonization. No ecumenical council has yet exercised the prerogative of proclaiming a Doctor of the Church. Ambrose, Augustine, Jerome, and Pope Gregory I were the original Doctors of the Church and were named in 1298. They are known collectively as the Great Doctors of the Western Church. The four Great Doctors of the Eastern Church, John Chrysostom, Basil the Great, Gregory of Nazianzus, and Athanasius were recognized in 1568 by Pope St. Pius V. Although the revered Catalan philosopher Ramon Llull was dubbed "Doctor Illuminatus," he is not officially considered a Doctor of the Church.