Bethsaida (“House of Fisherman” in Aramaic) is one of the most important sites in the New Testament. According to John 1:44, 12:20, Bethsaida was the birthplace of three of Jesus’s apostles (Peter, Andrew, and Philip). Mark describes how Jesus healed a blind man within reach of Bethsaida (Mark 8:22-26), and how Jesus walked on water near Bethsaida (Mark 6:45-52). Luke indicates that the miracle of multiplying bread and fish to feed the multitudes also took place on the way to Bethsaida (Luke 9:10-11).
In the fifth season of excavations at el-Araj, the expedition uncovered three Greek inscriptions in the mosaic floor of the church. One, which was preserved in its entirety, is particularly important. It’s set in 11 lines within a circular frame, 1.2 in diameter.
The inscription blesses ‘Constantine, servant of Christ’ for establishing the church’s diakonikon (=service area), and mentions prayers for him and his sons, Georgios and Theophanes. The crucial part is the reference to the church as built for ‘the chief of the apostles’ (κορυφὴ τῶν ἀποστόλων) and ‘the keeper of the keys to heaven’ (τῶν οὐρανίων κλειδοῦχος). This expression uses the same words with which Jesus appointed Peter as the keeper of the keys to the kingdom of heaven (κλεῖδας τῆς βασιλείας τῶν οὐρανῶν) (Matthew 16:19). (Taken from https://dannythedigger.com/new-inscription-confirms-bethsaida/)