another failed attempt to occupy the city during a night raid. Eventually the citizens were fed up with their lords, and in 1368 Freiburg purchased its independence from them. The city turned itself over to the protection of the Habsburgs, who allowed the city to retain a large measure of freedom. Most of the nobles of the city died in the battle of Sempach (1386). The patrician family Schnewlin took control of the city until the guildsmen revolted. The guilds became more powerful than the patricians by 1389.
The silver mines in Mount Schauinsland provided an important source of capital for Freiburg. This silver made Freiburg one of the richest cities in Europe, and in 1327 Freiburg minted its own coin, the Rappenpfennig. In 1377 the cities of Freiburg, Basel, Colmar, and Breisach entered into an alliance known as the Genossenschaft des Rappenpfennigs (Rappenpfennig Collective). This alliance facilitated commerce between the cities and lasted until the end of the 16th century. There were 8,000-9,000 people living in Freiburg between the 13th and 14th centuries, and 30 churches and monasteries. At the end of the 14th century the veins of silver were dwindling, and by 1460 only around 6,000 people still lived within Freiburg's city walls. A university city, Freiburg evolved from its focus on mining to become a cultural center for the arts and sciences. It was also a commercial center. The end of the Middle Ages and the dawn of the Renaissance was a time of both advances and tragedy for Freiburg.
In 1457, Albrecht VI, Regent of Further Austria, established Albert-Ludwigs-Universit�t, one of Germany's oldest universities. In 1498, Emperor Maximilian I held a Reichstag in Freiburg. In 1520, the city ratified a set of legal reforms, widely considered the most progressive of the time. The aim was to find a balance between city traditions and old Roman Law. The reforms were well received, especially the sections dealing with civil process law, punishment and
