When Irish clergy travelled abroad and made any stay in Gaul or England the Celtic peculiarity which was most troublesome to their hosts was their date for celebrating Easter. They were doctrinally orthodox, they were exceptionally devout: no fault could be found in the early seventh century on these grounds. Even their other oddities, such as a distinctive tonsure, episcopal consecration by one bishop, or bishops without jurisdiction, were less immediately important than the celebration of Easter at a time different from that observed by Christians elsewhere. So when conflict arose, it was on this issue.