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.
how does the doctor ctesias appear in pop culture
In the twenty-fourth and last episode of the first season of Space: 1999, The Last War, the warship from the alien planet Betha is named Ctesias.

Question: what king did the doctor serve
Self-contained rewrite: what king did the doctor ctesias serve