The Angola White-lady Butterfly is also called the Angola White-lady Swordtail since although it has no tail it is related to the Swordtail family.
Despite the name "Angola" it is native in much of sub-saharan Africa.
It's relative, the Small White-lady Swordtail, Graphium morania, is similar.
The White-lady is one of the many butterfly species that mimics the Danaid family, gaining some protection from the Danaid's toxicity.
In particular it resembles the Dusky Danaid/Black Friar.