The Theatre, earliest known public building of the Augustan Age (end first century B.C) testified to the important historical moment when Milan, Roman municipium as from 49 B.C., began to construct important public buildings, both sacred and secular. Built on semi-circular design, the Theatre could hold 8,000 spectators, seated on tiered stone bleachers which rested in arches and galleries. The site of theatrical performances, games, festivals and meetings, it maintained its use for meetings for the public until the twelfth century when, after the destruction of the city by the Emperor Fredrick RedBeard, it was lost to memory.