The empire was put under the property of a regent in the person of Perdiccas in 323 BC , and the territories were divided between Alexander 's generals , who thereby became satraps , at the Partition of Babylon in 323 BC . The empire was put under the authority of a regent in the person of Perdiccas in 323 BC , and the territories were divided between Alexander 's generals , who thereby became satraps , at the Partition of Babylon in 323 B.C.