Piazza Primo Maggio is located at the foot of the Castle of Udine and is the largest square in the capital, Friuli. There are several legends about the origin of the square, one of which states that Attila ordered his soldiers to build a high hill from which he could admire the burning of Aquileia, where the castle stands today. The result of the excavations led to a depression in which the square now stands. In the early days of the city, this depression was used to collect water from the rye. Another legend says that in ancient times the square was a large lake with a huge monster living in the middle that devoured the Friulian citizens. One day a skilled warrior came and killed the monster and freed the Friulian people from the terrible creature; it is believed that a rib of the terrible monster is kept in the Monastery of the Madonna delle Grazie. The size and beauty of Piazza Udinese is such that it is also mentioned in the fifth novella Decamerone by the famous writer Boccaccio. In fact, Piazza Primo Maggio was initially a small swamp that the ancient residents of Udien tried to rehabilitate, and slowly from a damp place used as a public outhouse, it became a place where markets, fairs and shows came to life were awakened. Today Piazza Primo Maggio is the place where most of the fairs and markets in the capital Friuli take place.