Roma was facing a political crisis, many senators and politicians were fighting to see who gains power of Rome and Octavian the son of Caesar become the sole ruler of Rome and saved everyone from more bloodshed. (from the civil war)
Pacal the great, ruling until his death, was a great mayan leader. His impact on society was mainly cultural, ordering the conrtuction of many buildings.
Moctezuma I was a very important Aztec ruler, that reformed many rules in the society such as economical and political ones.
Huayana Capac is a famous Inca empreror, mainly because he lived in the times of the Spanish colonization, and did great things.
Hope it helped,
BioTeacher101