2d one using unleavened bread in the Eucharist (7) a?y?i?e
24a conference in 664AD that resolved differences between Celtic & Roman forms of worship(5,2,6)
Synod of ???t?y
Just a point, Many answers like this can be easily found, google" 644ad conference", and it is faster than waiting for a response from Q&P. As I say, just a point.