the founding of the city. It comes, along with the name of the River Aare (which was called Arula, Arola, and Araris in early times), from the German word Au, meaning floodplain. Old town The historic old town forms an irregular square, consisting of four parts (called Stöcke). To the south lies the Laurenzenvorstadt, that is, the part of the town formerly outside the city wall. One characteristic of the city is its painted gables, for which Aarau is sometimes called the "City of beautiful Gables". The old town, Laurenzenvorstadt, government building, cantonal library, state archive and art museum are all listed as heritage sites of national significance. The buildings in the old city originate, on the whole, from building projects during the 16th century, when nearly all the Middle Age period buildings were replaced or expanded. The architectural development of the city ended in the 18th century, when the city began to expand beyond its (still existing) wall. Most of the buildings in the "suburb" date from this time. The "Schlössli" (small Castle), Rore Tower and the upper gate tower have remained nearly unchanged since the 13th century. The "Schlössli" is the oldest building in the city. It was already founded at the time of the establishment of the city shortly after 1200; the exact date is not known. City hall was built around Rore Tower in 1515. The upper gate tower stands beside the southern gate in the city wall, along the road to Lucerne and Bern. The jail has been housed in it since the Middle Ages. A Carillon was installed in the tower in the middle of the 20th century, the bells for which were provided by the centuries-old bell manufacturers of Aarau. The town church was built between 1471 and 1478. During the Reformation, in 1528, its twelve altars and accompanying pictures were destroyed. The "Justice fountain" (Gerechtigkeitsbrunnen) was built in 1634, and is made of French limestone; it includes a statue of Lady Justice made of sandstone, hence the name. It was originally in the street in front of city hall, but was moved to its present location in front of the town church in 1905 due to increased traffic. Economy , Aarau had an unemployment rate of 2.35%. , there were 48 people employed in the primary economic sector and about 9 businesses involved in this sector. 4,181 people are employed in the