The Lex Curiata of Imperium is the law that gave the magistrates of ancient Rome all the power they had over Roman society. It was the same regulation that kept them in power and that defined the hierarchical structure from which new magistrates, consuls, praetors and the king himself were elected. The Imperium, that is how the power exercised by the magistrates and maiores (consuls and praetors) was directly called, was acquired just after their appointment. There were two types of Imperium, previously established in the Lex Curiata.
The Lex Curiata of Imperium was created in the Curiata Comicios, an assembly created by the first thirty curiae created, from which the patricians would emerge, however some historians differ from this version, as they claim that in fact the Imperium was in fact only a ratification of power and not a power as such.
The first of them was the Imperium Domi, which was exercised within the city of Rome. In addition to maintaining order and forcing the Romans to follow the laws, it also controlled any type of relationship or transaction between visitors from other towns or regions with the inhabitants of Rome.
The second Imperium was the Military, and it was exercised by the commanders when the Roman army went to war. The Lex Curiata of Imperium allowed a provisional Imperium to all those leaders of the military armies of Rome. The magistrates granted him this power so that in battle they made the decisions that they considered pertinent to safeguard the lives of the fighters or carry out actions that were not within the planned lines.