Eborius is only mentioned as one of the three bishops from Roman Britain attending the Council of Arles in 314.
That council was convoked by Constantine the Great with the special object of settling the question of the Bishopric of Carthage, disputed between Cyprian and Donatus.
[1] The other two British bishops at Arles were ‘Restitutus, episcopus de civitate Londinensi’ (London) and ‘Adelfius episcopus de civitate colonia Londinensium.’ The latter name has variously been read as Lindum (Lincoln) or Camulodunum (Colchester).
The above facts are in Labbe's ‘Concilia’ from a Corvey MS., and Isidorus Mercator's list substantially agrees in including ‘Eburius,’ though it describes him only as ‘ex provincia Britanniæ’.
The passage is wrongly punctuated in Migne's edition; but in Crabbe the reading is ‘ex provincia Bizacena, civitate Tubernicensi, Eburius episcopus.’ Tillemont conjecturally identifies Eborius with the Hibernius who joins in a synodal letter to Pope Sylvester I, but this seems quite arbitrary.