Kaiserswerth is one of the oldest quarters of the City of Düsseldorf, part of Borough 5. It is in the north of the city and next to the river Rhine. It houses the where Florence Nightingale worked. Kaiserswerth has an area of , and 7,923 inhabitants (2020). History About the year 700 the monk Saint Suitbert founded a Benedictine abbey at Werth, a river island that formed an important crossing point of the Rhine. The abbey was destroyed 88 years later. On that area there is now the "Erzbischöfliches Suitbertus-Gymnasium", an archiepiscopal secondary school with the old chapel and parts of the abbey. The former monastery garden is a meeting point for the upper school between lesson times. The Kaiserpfalz which is a general term for a temporary seat of the Holy Roman Emperor was built at an unknown date but before the year 1016. In 1062, the archbishop of Cologne, Anno II, kidnapped the underage German King Heinrich IV from here and in this way obtained the unofficial regency of the Holy Roman Empire. At this time the island's name changed from Werth to Kaiserswerth. In 1174, Friederick I Barbarossa moved the Rhine customs collection to Kaiserswerth. The eastern branch of the Rhine around the island silted up connecting Kaiserswerth to the east bank of the river. In 1273, the emperor pledged Kaiserswerth to the Archbishop of Cologne forming a de facto enclave within the Duchy of Jülich-Berg. In 1591, Friedrich Spee von Langenfeld was born in Kaiserswerth. Due to its strategic position the town changed regularly. The town was captured in 1586 during the Cologne War, and then occupied by the Spanish from 1589 to 1592. In 1636 the town was captured again by the forces of Hesse. When in 1688 the Elector of Cologne made an alliance with Louis XIV during the War of the Grand Alliance he gave the French access to the Rhine crossing at Kaiserswerth. This caused the Dutch and Brandenburg to lay siege to the town in the June 1689. The French garrison surrendered at the end of the month when their supplies were destroyed by fire. The French reoccupied Kaiserswerth in 1701 during the War of the Spanish Succession and the Allies laid siege to it again in 1702. After a long and hard struggle the town surrendered and the Alliance decided to demolish the fortifications. In the 19th century Kaiserswerth was