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John was likely younger, and ostensibly less significant, than his brother the Apostle James, given that John was referenced in the Gospels merely as the "brother of James," and John may have been merely a teenager during the ministry of Jesus. For example, Mark 3:17 introduces John this way: "James the son of Zebedee and John the brother of James," which strongly suggests that James was the older son of Zebedee, and John was James' younger brother.<ref>Quoting [[ESV]]. See also: Mark 5:37.</ref> (''see [[Mystery: Was John the Apostle a child]]'')
Tradition holds that John was the only one of [[the disciples]] who was not [[martyr]]ed. He died of old age in exile.