Partisans of Herod Antipas, Matthew 22:16; Mark 3:6. Herod was dependent on the Roman power, and his adherents on the Roman power, and his adherents therefore maintained the propriety of paying tribute to Caesar, which the Pharisees denied. This explains Matthew 22:16.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'HERODIANS'". "American Tract Society Bible Dictionary".