Which christian disciple martyr known as jesus' "right hand man" continued to preach and spread christianity in the roman empire after jesus was crucified?

Peter was Jesus’ right-hand man

Explanation:

Peter was a fisherman, that Jesus chose as the leader when the disciples lacked motivation or were doubtful.

Thanks to Peter's enthusiastic and energetic personality, the message of Christ coming to earth and his crucifixion was broadly heard in the cities along the Middle East and into the Mediterranean.

It is believed that both Peter and Paul founded most churches in Rome during the first century after Christ's death.

Peter became a martyr since he was crucified in Rome as Nero was in power. The Christian tradition regards him as the first Bishop of Rome- have Catholicism based his belief of continuing the works since then.

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