The rajah and pasha butterflies, also known as emperors in Africa and Australia, (genus Charaxes) make up the huge type genus of the brush-footed butterfly subfamily Charaxinae, or leafwing butterflies. They belong to the Charaxini tribe, which also includes the Nawab butterflies (Polyura). Charaxes are tropical Old World butterflies, with by far the highest diversity in sub-Saharan Africa, a smaller number from South Asia to Melanesia and Australia, and a single species (Charaxes jasius) in Europe. They are generally strong flyers and very popular among butterfly collectors.