Saint Fergus was an 8th-century bishop and missionary who played a significant role in converting people in Scotland. Although his exact birth details are unknown, he is often identified as a Pictish bishop, possibly originating from northeastern Scotland. He is recorded as having served as a bishop in Ireland before traveling to Alba with a group of clerics. During his mission, he established several churches in regions such as Upper Strathearn and Caithness, contributing to the spread of Christianity in the area.