Viadrina European University (German: Europa-Universität Viadrina Frankfurt (Oder), hence its frequent appearance as "European University Viadrina Frankfurt (Oder)" in English) is a university located at Frankfurt (Oder) in Brandenburg, Germany. It is also known as the University of Frankfurt (Oder). The city is on the Oder River, which marks the border between Germany and Poland. With 5,200 students — around 1,000 of whom come from Poland — and some 160 teaching staff, the Viadrina is one of Germany's smallest universities (only the University of Erfurt and Jacobs University Bremen have fewer students). The word "Viadrina," from Latin, means "belonging to, or situated at, the Oder River": it derives from Viadra, the Latin name for the Oder (the city of Frankfurt was known in Latin as Francofortum ad Viadrum). The Alma Mater Viadrina was founded in 1506 by Joachim I Nestor, Elector of Brandenburg, as the principal university of Brandenburg. It was organized into four faculties: law, theology, philosophy, and medicine.