Máel Ruba was a 7th-century Irish monk who became a significant missionary in Scotland. Born in the vicinity of Derry and educated at Bangor, he traveled to Scotland in 671. He established a major monastic community at Applecross, which served as a vital center for spreading both Gaelic culture and Christian faith among the Picts. His influence extended across various regions, including the islands of Skye and Lewis, through his missionary work and the founding of numerous churches.