Through the Partition of Babylon a compromise was reached under which Perdiccas was to serve as "Regent of the Empire" and supreme commander of the imperial army. Arridaeus and the unborn child of Alexander's wife Roxana (the future Alexander IV of Macedon) were recognized as joint kings. While the general Craterus was officially declared "Guardian of the Royal Family", Perdiccas effectively held this position, as the joint kings were with him in Babylon. Perdiccas soon showed himself intolerant of any rivals, and, acting in the name of the two kings, sought to hold the empire together under his own hand. Alexander the Great's second wife, Stateira, was murdered. Perdiccas had Meleager arrested and murdered.