Quoted from Wikipedia [1]:
Andrew the Apostle...also called Saint Andrew, was an apostle of Jesus according to the New Testament. He is the brother of Saint Peter. He is referred to in the Orthodox tradition as the First-Called...According to Orthodox tradition, the apostolic successor to Saint Andrew is the Patriarch of Constantinople.
Quoted from Catholics Online [2]:
According to the New Testament, Andrew was born in the village of Bethsaida on the Sea of Galilee during the early first century. Much like his younger brother, Simon Peter, Andrew was also a fisherman...
In the Gospel of Matthew, it is said Jesus was walking along the shore of the Sea of Galilee and saw Andrew and Simon Peter fishing. It is then he asked the two to become disciples and "fishers of men."In the Gospel of Luke, Andrew is not initially named. It describes Jesus using a boat, believed to be solely Simon's, to preach to the multitudes and catch a large amount of fish on a night that originally was dry. Later, in Luke 5:7, it mentions Simon was not the only fisherman on the boat, but it is not until Luke 6:14 that there is talk of Andrew being Simon Peter's brother.However, the Gospel of John tells a separate story, stating Andrew was a disciple of John the Baptist. When Jesus walked by one day, John the Baptist stated, "Behold, the Lamb of God!" It is then that Andrew and another made the decision to follow Jesus.Little else is said about Andrew in the Gospels, but it is believed Andrew was one of the closer disciples to Jesus. It was he who told Jesus about the boy with the loaves and fishes, according to John 6:8. When Philip wanted to speak to Jesus about Greeks seeking him, he spoke to Andrew first. Andrew was also present at the last supper.Per Christian tradition, Andrew went on to preach the Good News around the shores of the Black Sea and throughout what is now Greece and Turkey. Andrew was martyred by crucifixion in Patras. He was bound, rather than nailed, to a cross, as is described in the Acts of Andrew. He was crucified on a cross form known as "crux decussata," which is an X-shaped cross or a "saltire." Today this is commonly referred to as "St. Andrew's Cross." It is believed Andrew requested to be crucified this way, because he deemed himself "unworthy to be crucified on the same type of cross as Jesus."
[1] https://en.wikipedia.org/wiki/Andrew_the_Apostle, quoted without hyperlinks and references.