After the three-year conflicts in 508 b.c. Klisthenis came to power, he placed the foundations of Athenian democracy with serious reforms. The most important was the increase of the races from four toten and the parallel distribution of the city in Trities and municipalities. Klisthenis strengthened the young democracy with the institution of ostracism. Ostracism constituted a political means for the provisional removal from the city for five to ten years of citizens that were considered suspects for the challenge of political agitations and were thus named because the votes of citizens were engraved on shell. Even though initially it was used for partisans of Pisistratos and the tyranny, it was then turned against every Athenian citizen considered to be dangerous for the regime. Klisthenis placed the bases of equality before the law with the massive attendance of citizens in all the ranks, in which all had right of attendance via draw except for few citizens. Then, after it won the allied troops of Spartans with their Viotians it installed in the territories of Chalkida four hundred non land owners, blunting thus the demand of reallocation of Attica of ground. During this period the Eleusinia Mysteries became widely known, while the first tragic dances of Thespidos, which took their name from the ancient dramatic Thespi, contemporary to Solona and Pesistrato made their appearance. Thespis is considered the author of dramatic art, after he imported the "hypocrite", that is to say the actor that exchanged words with the men of dance of Dithiramvo. The dance was constituted by fifty men in honour of god Dionisos. From the innovation of Thespis the tragedy resulted and then the theatre was born.