Conversation so far:
who came up with the idea of a unicorn
The first written account of a unicorn in Western literature comes from the Greek doctor Ctesias in the 4th century BCE.
Did Ctesias write about other subjects besides unicorns?
Indica is a book by the classical Greek physician Ctesias purporting to describe India, it is the first known Greek reference to that distant land.

Question: how does the doctor appear in pop culture
Self-contained rewrite: how does the doctor ctesias appear in pop culture