Marianus Scotus, originally named Muiredach mac Robartaig, was an eleventh-century Irish monk and scribe. Born in Donegal, he departed Ireland in 1067 to begin a pilgrimage toward Rome. Instead of reaching Italy, he traveled to Germany, where he joined the Benedictine order in Bamberg. He eventually settled in Regensburg, where he established the monastery of St. Peter and served as its inaugural abbot until his death around 1088.