This description of the Apostle John is from Easton" Bible Dictionary.
The Apostle John, brother of James the "Greater" (Matthew 4:21; 10:2; Mark 1:19; 3:17; 10:35). He was one, probably the younger, of the sons of Zebedee (Matthew 4:21) and Salome (Matthew 27:56; comp. Mark 15:40), and was born at Bethsaida. His father was apparently a man of some wealth (comp. Mark 1:20; Luke 5:3; John 19:27). He was doubtless trained in all that constituted the ordinary education of Jewish youth.
When he grew up he followed the occupation of a fisherman on the Lake of Galilee. When John the Baptist began his ministry in the wilderness of Judea, John, with many others, gathered round him, and was deeply influenced by his teaching. There he heard the announcement, "Behold the Lamb of God," and forthwith, on the invitation of Jesus, became a disciple and ranked among his followers (John 1:36,37) for a time.
He and his brother then returned to their former avocation, for how long is uncertain. Jesus again called them (Matthew 4:21; Luke 5:1-11), and now they left all and permanently attached themselves to the company of his disciples. He became one of the innermost circle (Mark 5:37; Matthew 17:1; 26:37; Mark 13:3). He was the disciple whom Jesus loved.
In zeal and intensity of character he was a "Boanerges" (Mark 3:17). This spirit once and again broke out (Matthew 20:20-24; Mark 10:35-41; Luke 9:49,54). At the betrayal he and Peter follow Christ afar off, while the others betake themselves to hasty flight (John 18:15). At the trial he follows Christ into the council chamber, and thence to the praetorium (John 18:16,19,28) and to the place of crucifixion (John 19:26,27). To him and Peter, Mary first conveys tidings of the resurrection (John 20:2), and they are the first to go and see what her strange words mean. After the resurrection he and Peter again return to the Sea of Galilee, where the Lord reveals himself to them (John 21:1,7). We find Peter and John frequently after this together (Acts 3:1; 4:13).
John remained apparently in Jerusalem as the leader of the church there (Acts 15:6; Galatians 2:9). His subsequent history is unrecorded. He was not there, however, at the time of Paul's last visit (Acts 21:15-40). He appears to have retired to Ephesus, but at what time is unknown. The seven churches of Asia were the objects of his special care (Revelation 1:11). He suffered under persecution, and was banished to Patmos (Revelation 1:9); whence he again returned to Ephesus, where he died, probably about A.D. 98, having outlived all or nearly all the friends and companions even of his maturer years. There are many interesting traditions regarding John during his residence at Ephesus, but these cannot claim the character of historical truth.