Cyril of Alexandria — as excerpted in the Catena Aurea on Luke 10:1-2

“God had made known by the Prophets that the preaching of the Gospel of salvation was to embrace not only Israel, but also the Gentile nations; and therefore after the twelve Apostles, there were other seventy-two (Vulg. septuaginta duos.) also appointed by Christ, as it is said, After these things the Lord appointed other seventy-two also.”