St. Fillan was a 7th-century Christian missionary and abbot, known for his work in spreading Christianity in what is now Scotland. He is often associated with the region of Strathearn and is believed to have founded several churches. His legacy includes the St. Fillan's Church in Falkland and the St. Fillan's Well, which were important pilgrimage sites. St. Fillan is also linked to various legends, including the healing powers attributed to his relics, making him a significant figure in Scottish religious history.