When Caligula finally became emperor in 37 AD, he not only released his friend but granted him rule of Philip's former tetrarchy (slightly extended), with the title of king.
Ketika Caligula akhirnya menjadi kaisar pada tahun 37 M, ia bukan hanya dibebaskan namun diberikan pemerintahan bekas tetrarki Philip (yang sedikit diperluas), dengan gelar raja.