In 1493 an astronomical clock was commissioned by Venice and it was decided to install it in a new clocktower in the Piazza with a high archway beneath it leading into the street known as the Merceria, which leads to the Rialto.
En 1493 un reloxo astronómico foi encargado por Venecia e decidiuse instalalo na praza nunha nova torre do reloxo cunha alta arcada debaixo dela que conduce á rúa coñecida como a Merceria, o que conduce á Rialto.