Jesus had prophesied that his followers would experience persecution and difficulty (Luke 11:49–51). For the first time since his death, Roman authorities acted violently against the church. James, the brother of John, was among the first disciples Jesus called (Mark 1:16–20; Luke 5:1–11). He was one of the first Christians killed because of his faith.
King Herod Agrippa took action to intentionally harm the church (Acts 12:20–23). It is possible that doing this was meant to strengthen his political alignment with the Jewish people. The letter of James, the brother of Jesus, was probably written after this persecution effort to the Christians who were scattered (see 8:1–4; James Book Introduction, “Date of Writing”).