The Marburger Schloss (Marburg castle), a.k.a. Landgrafenschloss Marburg, is a castle in Marburg, Hesse, Germany, located on top of Schlossberg (287 m NAP). Built in the 11th century as a fort, it became the first residence of Landgraviate of Hesse (HRE). Marburg Colloquy had been held here in 1529.