According to a legend embodied in later medieval chronicles, SAINT Rule or SAINT REGULUS, a Greek monk, was in the year 345 warned in a vision that the Emperor Constantine intended to remove the holy relics of the Apostle Andrew from Patras, where they were preserved, to Constantinople, the then capital of the Eastern Roman Empire.

He acted upon the Devine revelation, and accordingly, it is related, went to the shrine wherein. They were kept and took thereof the arm bone, three fingers of the right hand, a tooth, and one of the Apostle's knee-caps and set out with there to a region towards the west, situate in the utmost part of the world. After a perilous voyage with a company of devout men and women he made landfall on the coast near the present town of St Andrews, where he is supposed to have erected a church in commemoration and thanksgiving for their merciful survival. What basis of truth there nay be in this legend it is impossible to say.

It is also related that at the time Rule landed a vision of the Apostle was revealed to Angus mar Fergus, King of the Picts, promising him victory over his enemies. Angus in gratitude for his subsequent victory dedicated the place to which the relics had been brought "to God and St. Andrew to be head and mother of all the churches in the kingdom of the Pict, Rule carrying upon his head the relics of St Andrew, his followers chanting hymns,while the King and his men followed them: round the consecrated ground erected twelve stone crosses. By association with Angus the arrival of Rule is brought down to a later and more probable date in the eighth century. We can accept Rule as the founder of the earliest Christian settlement at St Andrews."

This information copied from "St Andrews Cathedral" written by Stewart Cruden ARIBA, FSA Inspector of Ancient Monuments for Scotland and published at Edinburgh by Her "majesty's Stationary Office.