Rome's early history is shrouded in legend. According to Roman tradition, the city was founded by Romulus on 21 April 753 BC.The legendary origin of the city tells that Romulus and Remus decided to build a city. After an argument, Romulus killed his brother Remus. Archaeological evidence supports the view that Rome grew from pastoral settlements on the Palatine Hill built in the area of the future Roman Forum. While some archaeologists argue that Rome was indeed founded in the middle of the 8th century BC, the date is subject to controversy.The original settlement developed into the capital of the Roman Kingdom (ruled by a succession of seven kings, according to tradition), and then the Roman Republic (from 510 BC, governed by the Senate), and finally the Roman Empire (from 27 BC, ruled by an Emperor). This success depended on military conquest, commercial predominance, as well as selective assimilation of neighbouring civilisations, most notably the Etruscans and Greeks.