Magnus of Fussun, otherwise Magnoald or Mang, was a missionary saint in southern Germany, also known as the Apostle of the Allgäu. He is believed to have been a contemporary either of Gall (died 627) or of Boniface (died 754) and is venerated as the founder of St. Mang's Abbey, Füssen.

There is almost no reliable information about him. The only source is an old "Vita S. Magni", which however contains so many obvious anachronisms that little reliance can be placed on it. It relates that the two Irish missionaries Columbanus and Gallus, spent some time with Willimar, a priest at Arbon. Here Gallus fell sick and was put in charge of Magnus and Theodore (Magnoald and Theodo), two clerics living with Willimar, while Columbanus proceeded to Italy and founded Bobbio Abbey.

When Gallus had been miraculously informed of the death of Columbanus he sent Magnus to pray at his grave in Bobbio. Magnus returned with the staff of Columbanus and thereafter they followed his rule. After the death of Gallus, Magnus succeeded him as superior of the cell.

About this time a priest of the Diocese of Augsburg, named Tozzo or Toto, came as a pilgrim to the grave of Gall and invited Magnus to accompany him to the eastern part of the Allgäu. Magnus proceeded to Eptaticus (Epfach), where Wikterp, Bishop of Augsburg received him and entrusted him with the Christianization of the eastern Allgäu. He penetrated into the wilderness, then crossed the river Lech at a place still known as St. Mangstritt ("footstep of Saint Magnus") and built a cell, where afterwards the monastery of Füssen was erected, and where he died.

He was buried in the church he had constructed. In 851 he was reburied in the newly erected church. One of his bones was sent to St Gallen in Switzerland. Around the year 1100 all his bones were found to be missing. The burial place can be seen in the crypt of St Mang Basilica, Füssen. A tiny splinter of the breast bone was sent from St Gallen to Füssen and this is now located in a large glass cross hanging above the main altar. It also contains the staff, cross and chalice of the saint.

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