Final answer:
Cadmus, on the orders of Apollo, follows a cow with a half moon and founds the city of Thebes.
Step-by-step explanation:
The individual who follows a cow with a half moon and founds the city of Thebes on the orders of Apollo is Cadmus. Cadmus is part of a family of Oracles and is known for killing a dragon and sowing its teeth to create the first men of Thebes.