Who in ancient Rome could convene citizens to the next popular meeting?

In ancient Rome, regular popular assemblies (comitia) could be convened: a) curiate national assemblies – kings or appointed rulers in the period between kings; b) centuriate national assemblies – the highest magistrates; c) tributary popular assemblies – dictators, praetors or consuls. Comitia appeared approximately in the 8th century BC, their decline began in the 1st century BC, at this time they become a formality, and finally disappear in the 1st century AD. Initially, the people’s assemblies decided issues of war and peace, later they began to solve legislative issues.