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Once the office of bishop was clearly established in the early Church as the unitary head of a diocese (a Roman administrative unit), that office was filled by someone chosen by local people and priests, then ratified by the neighboring bishops, as a sign of the unity of the Church. Even the unbaptized were eligible, as we know from the oft-told story of St. Ambrose, whom the clergy and people of Milan chose as their bishop while he was still a catechumen.