For centuries during the Middle-Ages, the Estates of Overijssel – a diet or feudal parliament, representing the knighthoods of Salland, Vollenhove and Twenthe (and, until 1527, also Drenthe) and the cities of Zwolle, Deventer and Kampen – convened at the still existing pub at Nieuwebrug. Following a feud between Kampen and Zwolle in 1519, however, the Estates were attacked by citizens of Zwolle, who abducted three noblemen and pillaged the nearby Eerde castle. During the years that followed, conflict escalated in Overijssel.