revision preference src: Ptolemy ruled Egypt from 323 BC, nominally in the name of the joint kings Philip III and Alexander IV. However, as Alexander the Great's empire disintegrated, Ptolemy soon established himself as ruler in his own right. <SEP> tgt: Ptolemy ruled Egypt from 323 BC, nominally in the name of the joint kings Philip III and Alexander IV. As Alexander IV's empire disintegrated, Ptolemy soon established himself as ruler in Alexander IV's own right.