What were the contributions of the first settlers in Rome?

The main contribution of the first settlers of Rome was the foundation of the city. Rome was created through the political union of the peoples of settlements on the Seven Hills of Rome. The foundation also involved a fusion between the Latins of these hills and Sabines who settled of two of the hills. The foundation of Rome was attributed to Romulus. He built the first temples and the regia (royal house) in the forum, a wall around the Palatine Hill, organised an army and created the senate, 3 tribes (administrative divisions) and 30 curiae (voting units or constituencies). The second king, Numa Pompilius, created the first priesthoods of Roman state religion.