[Four]

I'll find it extremely funny when somebody actually conquers time travel and nobody will believe them.
He'll then turn to selfishness and conquer the world!

I'd take a platoon of troops with modern assault weapons and a ton of ammo and conquer ancient Rome.

Oh my god, yes!
After that, I'd find a way to exploit the system to gain eternal life or something.
I'd have a pet dinosaur to eat other kings as well.
I'd call my kingdom the OWO - Old world order!