A large rectangular boulder of red marble stands in front of the Town Hall steps. It is the so-called Preda Ringadora, or Ringadora Stone, one of the oldest symbols of the city. This boulder, which is over three metres long, owes its name to its medieval use, when it was used as a stage by orators and merchants. It was a harangue stone, hence the dialect name. But there are more gloomy uses of the Preda Ringadora, such as displaying corpses for identification and as a place of execution for capital punishment. It seems that in the Middle Ages the rock was also used as a stone of dishonour. Here, on market days, debtors were forced to climb up onto the stone to subject themselves to public ridicule, after having walked around the square with their heads shaved.