What is a Roman consul? Why did the Romans decide to have two consuls instead of just one?

A Roman consul is the highest elected political office of the Roman republic. It was considered the highest level of the cursus honorum. They decided to have two consuls so they didn't have to rely on one ruler to make all the decisions.

Explanation:

above.

1st part

A consul held the highest elected political office of the Roman Republic, and ancient Romans considered the consulship the highest level of the cursus honorum. Each year, the citizens of Rome elected two consuls to serve jointly for a one-year term.

2nd part

There were two consuls to create a check on the power of any individual. After the establishment of the Empire (27 BC), the consuls became mere symbolic representatives of Rome's republican heritage and held very little power and authority, with the Emperor acting as the supreme authority.

Explanation:

1st part

A Roman consul was the highest elected political office of the Roman Republic. Each roman consul was given the power of controlling each decision.  

2nd part

They were two counsels to control authority and see no revolution.

one of the major compromises in the constitutional convention was between the small states and big states. the small states wanted each state to have the same number of representatives in congress. the big states wanted representation based on population.