How long did the royal power last in Rome? In what century did the Roman Republic arise?

1) How long did the royal power last in Rome? 2) In what century did the Roman Republic arise? 3) Did it happen in the first or second half of the century? 4) How many years after the founding of the Roman Republic was the plebeian first elected consul? Please write a solution in the form of examples.

1. The emergence of the Roman kingdom dates back to 753 BC, the abolition of royal power in Rome took place in 509 BC, thus, this regime in Rome existed for 753 – 509 = 244 years.
2. In 509 BC, which corresponds to the 6th century BC.
3. This happened at the end of the 6th century BC, hence in the 2nd half of the century.
4. The first election of a plebeian consul took place in 367 BC, that is, 509 – 367 = 142 years after the founding of the Republic.