Herod Agrippa I, the Herod of Acts 12, had an interesting career. He was raised in Rome, and while he was there he became a friend of Gaius Caligula. That was not a great honor. Caligula turned out to be shockingly corrupt even in a shockingly corrupt age. But Herod got to know him, and when Caligula came to the throne, he appointed Herod to a prominent position. In A.D. 39 Herod was in Rome, contributed to the fall of Herod Antipas and received his tetrarchy as a result. After the ascension of Claudius in A.D. 41, Herod also received Judea and Samaria and therefore ruled at last over all the territory of his grandfather.