Alto an Irish missionary of illustrious family who arrived in Bavaria about A.D. 743. He lived a hermit life in a forest about midway between Augsburg and Munich. Pepin granted him a part of the forest for the purpose of erecting a monastery and a church. The latter was dedicated by St. Boniface, and the monastery was called, after him, Alto-Munster corrupted afterwards into Alt-Munster. The exact date of his death is unknown, but his memory is revered Feb. 9. See Langman, History of Ireland, 3, 189.