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Agrippa being one day overheard by his freedman Eutyches, to express a wish for Tiberius' death and the advancement of Caligula, was betrayed to the emperor and cast into prison.
Following Tiberius' death and the ascension of Agrippa's friend Caligula, he was made governor first of the territories of Batanaea and Trachonitis that his cousin Herod Philip had held, then of the tetrarchy of Lysanias, with the title of king.
Thus Agrippa became one of the greatest princes of the east, the territory he possessed equalling in extent that held by his grandfather Herod the Great.