314) was a Romano-British bishop, probably from Londinium (London), one of the British delegation who attended the church synod or Council held at Arles (Arelate), in Gaul, in AD 314.
The list of those who signed the Acta, the decisions made by the council, included three bishops, along with a "presbyter" and a "deacon", from Britain.
Since London was not a colonia,[3] most authorities have agreed that Adelfius' see is misrecorded, with proposed alternatives including Lindum (Lincoln) or Camulodunum (Colchester).
[2][4][5][6] Notwithstanding the debate about the role of Adelfius, it seems most probable that the identification of Restitutus as Bishop of London was correct.
His name does not appear in the list of supposed early "Archbishops of London" that the 16th-century historian John Stow attributed to Jocelin of Furness.