Son of Zebedee and brother of James, fisherman. One of the inner circle of three. He is traditionally identified as the 'disciple whom Jesus loved' in the Fourth Gospel. He wrote the Gospel of John, three epistles, and Revelation. He leaned against Jesus at the Last Supper. Jesus entrusted his mother Mary to John's care from the cross. He was one of the pillars of the Jerusalem church and spent his last years in Ephesus.
And going on from thence, he saw other two brethren, James the son of Zebedee, and John his brother, in a ship with Zebedee their father, mending their nets; and he called them.Matthew 4:21, KJV
John 13:23
Now there was leaning on Jesus’ bosom one of his disciples, whom Jesus loved.John 13:23, KJV
John 19:26
When Jesus therefore saw his mother, and the disciple standing by, whom he loved, he saith unto his mother, Woman, behold thy son!John 19:26, KJV
Acts 4:13
Now when they saw the boldness of Peter and John, and perceived that they were unlearned and ignorant men, they marvelled; and they took knowledge of them, that they had been with Jesus.Acts 4:13, KJV
Revelation 1:1
The Revelation of Jesus Christ, which God gave unto him, to shew unto his servants things which must shortly come to pass; and he sent and signified it by his angel unto his servant John:Revelation 1:1, KJV
See how John (apostle) connects to every other figure in Scripture.