Jean I (died 675) was an early Archbishop of Arles.
The diptychs point to two successive Johns who could be the same prelate.
[1][2] Moreover, the numbering followed here probably forgets a previous Johannes between Aeon and Césaire at the beginning of the fifth century.
[3] A letter was addressed to the monastery of Sainte-Marie d'Arles around 670.
[3] According to the historian Jean-Pierre Papon, he received Theodore, Archbishop of Canterbury.