St. Aidan’s Day is August 31st in the calendar of the Episcopal Church. St. Aidan was an important figure bridging the Celtic era to the Anglo-Saxon one in the 7th Century.
Our Pesher for St. Aidan’s Day is here:
https://2046ad.org/wp-content/uploads/2026/09/staidans.pdf
If you want to learn more about the early Celtic Church, go here:
And here: Britannia
If you want to read more about him from more traditional sources, the ancient Anglo-Saxon historian, The Venerable Bede, is the principal one. Online summaries can be found here:
http://www.staidanschurch.org/history-of-st-aidan
https://en.wikipedia.org/wiki/Aidan_of_Lindisfarne
On the Synod of Whitby: