Lazarus of Mount Galesius (born Leo, c. 972/981) was a Byzantine monk and stylite who founded a monastic community on Mount Galesius near Ephesus in Asia Minor. Born to a peasant family near Magnesia (modern Manisa, Turkey), in the region of Lydia, he left home in youth to pursue the monastic life.
After entering monastic life at Attaleia, he traveled to Palestine, where he spent about a decade at the celebrated Lavra of Saint Sabas and was ordained to the priesthood by the Patriarch of Jerusalem. Returning to his home region, he settled on Mount Galesius, where he took up the ascetic discipline of the stylite, living atop a pillar.
Around his pillar there developed a monastic community; in time he founded three monasteries on the mountain. His communities were organized so that the monks lived in individual cells rather than a strictly cenobitic common life, and were permitted to earn their own income by practicing a handicraft. He died on November 7, 1053, and is venerated in both the Eastern Orthodox and Roman Catholic Churches.