Leipzig was first mentioned in a document in 1015. t is located at the intersection of two important medieval trade routes: Via Regina and Via Imperii. For centuries it was an important centre of trade and trade fairs. There still is the annual Leipziger Buchmesse (Leipzig Book Fair). Leipzig today is an important finance centre. The Leipzig university was founded in 1409. Both Johann Sebastian Bach and Felix Mendelssohn-Bartholdy lived and worked in Leipzig. From 1899 to 1905 the New Town Hall was built on the location of the old Pleissenburg. The tower is 114.8 metres in height and said to be the highest town hall tower in Germany.