Saint Regulus or Saint Rule was a legendary 4th century monk or bishop of Patras, Greece who in AD 345 is said to have fled to Scotland with the bones of Saint Andrew, and deposited them at St Andrews. His feast day in the Aberdeen Breviary is 17 October.

Andrew the Apostle, also called Saint Andrew, was an apostle of Jesus. According to the New Testament, he was a fisherman and one of the Twelve Apostles chosen by Jesus. The title First-Called stems from the Gospel of John, where Andrew, initially a disciple of John the Baptist, follows Jesus and, recognizing him as the Messiah, introduces his brother Simon Peter to him.