Polyura is a subgenus of butterflies also referred to as Nawab butterflies and belonging to the brush-footed butterfly subfamily Charaxinae, or leafwing butterflies. Like the large and conspicuous forest queens, they belong to the genus Charaxes, unique genus of the tribe Charaxini.

The rajah and pasha butterflies, also known as emperors in Africa and Australia, make up the huge type genus of the brush-footed butterfly subfamily Charaxinae, or leafwing butterflies. They belong to the tribe Charaxini, 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 in Europe. They are generally strong flyers and very popular among butterfly collectors.