The Pipiltin (sg. pilli) were the noble social class in the Mexica Empire. They are the lowest nobles in the civilization's social structure and above the commoners who achieved noble status due to an outstanding deed in war. These people were members of the hereditary nobility and occupied positions in the government as ambassadors and ministers, the army and the priesthood. Pipiltin often headed their own noble houses, called tecalli, with their own lands and dependent labourers. The subclasses within the Pipiltin were: tlahtohcapilli (a tlahtoani's son), tecpilli or teucpilli (a teuctli's son), tlazohpilli (son of legitimate wife), and calpanpilli (son of a concubine).
