The Roman Kingdom (also referred to as the Roman monarchy, or the regal period of ancient Rome) was the earliest period of Roman history when the city and its territory were ruled by kings. According to oral accounts, the Roman Kingdom began with the city's founding 753 BC, with settlements around the Palatine Hill along the river Tiber in central Italy, and ended with the overthrow of the kings and the establishment of the Republic 509 BC. Little is certain about the kingdom's history as no records and few inscriptions from the time of the kings survive. The accounts of this period written during the Republic and the Empire are thought largely to be based on oral tradition. Origin The site of the founding of the Roman Kingdom (and eventual Republic and Empire) included a ford where one could cross the river Tiber in central Italy. The Palatine Hill and hills surrounding it provided easily defensible positions in the wide fertile plain surrounding them. Each of these features contributed to the success of the city. The traditional version of Roman history, which has come down to us principally through Livy (64 or 59 BC – AD 12 or 17), Plutarch (46–120), and Dionysius of Halicarnassus ( 60 BC – after 7 BC), recounts that a series of seven kings ruled the settlement in Rome's first centuries. The traditional chronology, as codified by Varro (116 BC – 27 BC) and Fabius Pictor ( 270 – 200 BC), allows 243 years for their combined reigns, an average of almost 35 years. Since the work of Barthold Georg Niebuhr, modern scholarship has generally discounted this schema. The Gauls destroyed many of Rome's historical records when they sacked the city after the Battle of the Allia in 390 BC (according to Varro; according to Polybius, the battle occurred in 387–6), and what remained eventually fell prey to time or to theft. With no contemporary records of the kingdom surviving, all accounts of the Roman kings must be carefully questioned. Monarchy The kings (excluding Romulus, who, according to legend, held office by virtue of being the city's founder), were all elected by the people of Rome to serve for life, with none of the kings relying on military force to gain or keep the throne. The insignia of the kings of Rome were twelve lictors (attendants or servants) wielding the symbolic fasces bearing axes, the