What is "ugrasena"

Ugrasena was the King of Mathura, a kingdom that was established after the various Yadava clans, which include the Vrishnis and Bhojas decided that the dividing states would unite as one and that the Kingship would not be subject to heredity (but could be) and if decided not to be so, the succeeding leader would be chosen by a simple majority, therefore, a semi-democracy was established. When the groups gathered, the uniting factions decided to throne Ugrasena as the king due to his skills in warfare and his humble nature towards domestic and foreign policy issues.