After the death of Romulus, Rome struggles to find a new king:
Once all of this had happened regarding Romulus, it seemed right to everyone that there should continue to be a monarchy, but strife and discord arose among those in Rome not just about who, individually, should be the king, but about whether he should be Roman or Sabine. To those first men who founded the city with Romulus, it seemed unbearable that the Sabines, who had come to the city after them, should take it in hand to rule. The Sabines thought, on the contrary, that since Romulus ruled by himself after the death of Titus Tatius, it was right that the new king should be selected from among themselves.
Both parties thus contended against each other. Since the state was thus held in suspense on this matter, the Patricians, being then 150 in number, established that each one…