With the old king defeated and given a proper burial, Alexander's rulership of Persia became official. This led to Darius being regarded by some historians as cowardly and inefficient, as under his rulership, the entirety of the Persian Empire fell to a foreign invader. After killing Darius, Bessus took the regal name Artaxerxes V and began calling himself the King of Asia. He was subsequently captured by Alexander, tortured, and executed. Another of Darius' generals ingratiated himself to Alexander by giving the conqueror Darius' favored companion, Bagoas.