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Many had considered Giovanni Battista Montini, the Archbishop of Milan, a possible candidate, but, although he was the archbishop of one of the most ancient and prominent sees in Italy, he had not yet been made a cardinal. Though his absence from the 1958 conclave did not make him ineligible – under Canon Law any Catholic male who is capable of receiving priestly ordination and episcopal consecration may be elected – the College of Cardinals usually chose the new pontiff from among the Cardinals who head archdioceses or departments of the Roman Curia that attend the papal conclave. At the time, as opposed to contemporary practice, the participating Cardinals did not have to be below age 80 to vote, there were few Eastern-rite Cardinals, and no Cardinals who were just priests at the time of their elevation.
Pope John XXIII