A prefecture (from the Latin Praefectura) is an administrative jurisdiction or subdivision in any of various countries and within some international church structures, and in antiquity a Roman district governed by an appointed prefect.
Piazza Unità d'Italia (Unity of Italy Square in English) is the main town square in Trieste, Italy. It is situated at the foot of the hill containing the castle of San Giusto and the square faces the Adriatic Sea. The square is often said to be Europe's largest square located next to the sea. The square was built during the period when Trieste was the main port of the Austrian-Hungarian Empire and includes the city's municipal buildings and other important palaces.
Before 1919 it was known as Piazza Grande, or Great Square. The local Slovenes still refer to it as Veliki trg (Great Square), both in daily speech and in the media. In the last decade, the term Trg zedinjenja (Unity Square) or Trg zedinjenja Italije (Unity of Italy Square) has also become popular, especially in official documents.