Mark 6:17
For it was Herod himself who had sent for John and had him arrested and chained up in prison. He did this to please Herodias, who was [i.e., had been] his brother Philip's wife, but whom Herod had married.
Matthew 11:2
Now while still in prison, John [the Immerser] heard about the things Christ was doing, [so] he sent [word] through his disciples
Luke 3:19-20
But because he had rebuked Herod, the tetrarch, for [marrying] his brother's wife Herodias, and for all the other bad things he had done,
Matthew 4:12
Now when Jesus heard that John had been arrested, He left [the province of Judea] and went to Galilee.
Matthew 14:3-12
For Herod had arrested John and had him chained and put in prison in order to please Herodias, his brother Philip's wife.
Luke 3:1
Now it was the fifteenth year of the reign of Tiberius Caesar. Pontius Pilate was governor of Judea, Herod was ruler of Galilee, his brother Philip was ruler of the regions of Ituraea and Trachonitus [Note: These two men were sons of Herod the Great (See Matt. 2:1) and ruled over provinces east of the Jordan River] and Lysanias was ruler of Abilene [Note: This was a province just north of the two previously mentioned ones].