Saint Colman of Lindisfarne was an Irish monk and the third bishop of Lindisfarne, a significant center of early Christianity in England. He is best known for his role in the Celtic Christian tradition and for his leadership during a time of religious transition. Colman became bishop in 661 AD and was a key figure in the establishment of the Celtic Church in Northumbria. Colman is particularly remembered for his opposition to the Roman method of calculating the date of Easter, which led to a significant theological dispute. After the Synod of Whitby in 664 AD, he chose to leave Lindisfarne and returned to Iona, where he continued his missionary work and promoted the Celtic practices of Christianity.