After the departure of the Spartans, factions of Athenian aristocracy, led by Isogoras, tried to restore aristocracy to the position of dominance before Solon's reforms. However, a chief of a rival aristocratic clan, Clisthenes challenged Isogoras. He looked towards the people for political support and won it with a program that had significant appeal. In response, Isogoras called in the Spartans who banished Clisthenes and his supporters. This caused an uproar with the populace, who refused to tolerate an aristocratic restoration and drove out the Spartans as well as Isogoras. It was then that Clisthenes and his supporters returned and put their program in effect. The central idea of Clisthenes reform was to reduce the influence of traditional localities and regions in Athenian life, as they were key sources of power for factions and nobility. He enrolled the disenfranchised, who supported him, replaced Attica's four tribes with ten new tribes organized so no region could dominate them, he replaced Solon's council of 400 with 500, but bestowed himself with final authority. Debate within the assembly was free and open, meaning any Athenian could submit legislation, amendments, or argue the merits of a question. Clisthenes did not alter Solon's property qualifications for officeholders, but he did enlarge the citizens rolls, minimised the power aristocrats held, and elevated the role of the assembly with council - giving him the title of Father of Athenian democracy.