Do we know if the Mexica knew of the existence to the, relatively large, Incan Empire to their south? If there was any foreign relations between the Aztecs/Incans?

by SamuraiRake

Knew of the existence of the* not to the. Sorry. Genuinely curious, as both civilizations were relatively large.

Mictlantecuhtli

There's always room for discussion, but perhaps the question Was there communication between Andean civilizations and Mesoamerican ones? answered by /u/400-rabbits from the Pre-Columbian Trade and Contact section of our FAQ will answer your inquiry.