Here is the summary from the Wikipedia about Saint Regulus:
Saint Regulus or Saint Rule of Andrew was a monk of Patras who, in the fourth century, according to a Scottish legend that became current during the twelfth century (National Archives of Scotland), fled to Scotland with the bones of Saint Andrew, and deposited them at St Andrews. His feast day in the Aberdeen Breviary is October 17.
Saint Regulus was galvanized into action by a visionary dream that Emperor Constantine had decided to remove Saint Andrew's relics from from Patras to Constantinople. Warned by an angel, he was to move as many bones as far away as he could to the 'ends of the earth' for safekeeping.
He was shipwrecked at Muckross on the shore of Fifeshire at the spot called Kilrymont, which is now St. Andrews, and was welcomed by a Pictish king, Hungus or Angus, who was actually of the eighth or ninth century. The monastery claimed to have three fingers of the saint's right hand, the upper bone of an arm, one kneecap, and one of his teeth. Kenneth II, King of the Scots, who defeated the Picts in 845 and then repaired and decorated the Church of St Regulus.