"An Irishman, possibly born in Connaught, St. Aidan was a monk known for his strict asceticism at the monastery on the island of Iona in Scotland. When the holy King Oswald of Northumbria wanted to convert his people to Christianity, he turned to the Celtic monks of Iona, rather than the Roman clergy at Canterbury.
St. Aidan was consecrated bishop and sent to Northumbria to take charge of the mission. King Oswald gave him the island of Lindisfarne near the royal residence of Bamburg for his episcopal See. St. Aidan also founded the famous monastery on Lindisfarne in 635.
St. Bede, in his ECCLESIASTICAL HISTORY OF THE ENGLISH PEOPLE praises Aidan for his humility and piety, recommending him as a model for other bishops and priests to follow.
He was not attached to the things of this world, nor did he seek earthly treasures. Whenever he received gifts from the king or from rich men, he distributed them to the poor. On Wednesdays and Fridays he would fast from all food until the Ninth Hour (about 3 P.M.), except during the paschal season.
He travelled mainly by foot and visited all he came across. As St. Bede tells us;
"Whether rich or poor, if unbelievers, to embrace the mystery of the faith, or, if already Christians, he would strengthen them in the faith and stir them up, by words and actions, to alms and good works. He was accustomed not only to teach the people committed to his charge in church, but also feeling for the weakness of a new-born faith, to wander round the provinces, to go into the houses of the faithful, and to sow the seeds of God's Word in their hearts, according to the capacity of each."
When a feast was set before him he would give the food away to the hungry. The presents he received were given to the poor or used to buy the freedom of slaves, some of whom entered the priesthood. During Lent Aidan would retire to the small island of Farne for prayer and penance.
Saint Aidan departed to the Lord on August 31. He died at Bamburgh, by the west wall of the church. The beam on which he was leaning to support himself still survives, even though the church was twice destroyed by fire. The beam may still be seen in the ceiling of the present church, above the baptismal font.
On the day St. Aidan died, St. Cuthbert (March 20) was a young man tending his master’s sheep. Looking up, Cuthbert saw a vision of angels bearing someone’s soul to heaven in a sphere of fire. Later, he learned that Bishop Aidan had died at the very hour that he had seen the vision.
At first, the holy bishop Aidan was buried at Lindisfarne on the right side of the altar in the church of St. Peter. In 664 the Synod of Whitby declared that all the churches of Britain must follow Roman practices, and that Celtic customs were to be suppressed. St. Colman, the third Bishop of Lindisfarne, was unable to accept this decision. Therefore, he decided to retire to Iona, taking the bones of Saint Aidan with him. Celtic customs survived on Iona until the eighth century."
[Sources: OCA/ St. Aidan's Episcopal Church/ Greek City Times/ orthodoxtimes(.com)]