57 Nor did these great honors paid to Leo by the official representatives of the Eastern Churches terminate with his death. The Byzantine liturgy keeps the 18th of February as his feast day, and most truly proclaims him as "leader of orthodoxy, teacher renowned for his holiness and majesty, star of the world, glory and light of Christians, lyre of the Holy Spirit." (51)
Source: Aeterna Dei Sapientia (Vatican.va)