Conversation so far:
when does assassin's creed origins take place
Assassin's Creed Origins is set in Ancient Egypt near the end of the Ptolemaic period.
when was the ptolemaic period
The Ptolemaic Kingdom lasted from 305 BC to 30 BC.
who ruled the ptolemaic kingdom
The Ptolemaic Kingdom was ruled by the Ptolemaic dynasty.
who was ruling the ptolemaic kingdom in assassin's creed origins
The ruler of the Ptolemaic Kingdom in Assassin's Creed: Origins, is Pharaoh Ptolemy XIII. His sister, Cleopatra, begins marshalling loyalist forces to launch a counter-coup against Ptolemy.

Question: was the relationship incestuous
Self-contained rewrite: was ptolemy the thirteenth and cleopatra the seventh's relationship incestuous