One ancient text - The Acts of Andrew - narrate Andrew's departure from Jerusalem to be a missionary and later to rescue another disciple, Matthias, from cannibals. He then went about exorcising demons, healing the sick, and raising the dead. He also was known for breaking up families by preaching mandatory celibacy. According to this text, Andrew converted Macimilla, the wife of the Roman proconsul Aegeates in Acheaea (in the region of the Black Sea), and she thereafter forswore sex with her husband. Subsequently Aegeates crucified the apostle next to the sea. Other traditions tell that Andrew was fastened to an X-shaped cross and suffered death at the hands of angry pagans. Some historians claimed that virtually every tribe on the shores of the Black Sea appealed to Andrew as the founder of its Church.
Reportedly, in the year 357, Andrew's remains were deposited in the Church of the Holy Apostles in Constantinople, along with those of Luke and Timothy. Sometime in the 8th century, Andrew was used to legitimate Byzantine claims to apostolicity. For years, the church in Rome has claimed Peter as its founder. On the other hand, Byzantium could claim no founding apostle. This was not a problem as long as Rome and Byzantium were on good terms, but when the two great church centers parted ways, Byzantium was desperate to have a apostolic pedigree. Andrew was perfect for this purpose because, according to the Gospel of John, it was Andrew who brought Peter to Jesus. Andrew came to be known as Protokletos - The First Called.
Andrew is the Patron Saint of Scotland. In 1204 crusaders stole Andrew's relics from Constantinople and took them to Amalfi, Italy. According to Celtic tradition the apostle's arm was taken to St. Andrew's, Scotland, where the archdiocese still celebrates the event each May 9th. Anglo-Saxon renderings of the Acts of Andrew show his importance in the British Isles at an early date.
In iconography, Andrew often appears with unkempt hair and a long beard, attended by a ship, a fish, or a net. His most distinctive signature is the X-shaped cross, a prominent feature of the Episcopal Shield, and his feast day in the Anglican Church is November 30th.
(source: Lesser Feasts and Fasts; The Anchor Bible Dictionary)