Nahuixtelotzin
Huey Tlatoani
The Tercios wer the backbone of the Spanish military during its heyday. If you imagine a Conquistador, you probably imagine a Tercio on a horse. The weapons od the Tercios were mixed - they had pikes and swords or muskets. Personally I'd like to see them as upgraded pikemen, although they were much later (those early pikemen in Civ3 suck. They're anachronistically)
Here's an example of what a Tercio might look like
Here's an example of what a Tercio might look like