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,

Now when King Herod, the tetrarch [i.e., governor of that district] heard about all that was happening [concerning Jesus], he was perplexed because some people were saying that John [the Immerser] had risen from the dead;