Working and living at Leineschloss—this began for Gottfried Wilhelm Leibniz in December 1676, shortly after he arrived in Hanover. When he took over the Duke’s library, it contained 3,310 volumes and 158 manuscripts. Thanks to his international contacts, he quickly expanded the collection. He also redesigned the Knights’ Hall in the palace. He recorded in sketches how the ceiling paintings and portraits of the Guelph princely family were to be arranged. The palace, built in 1637, underwent a magnificent renovation beginning in 1688. Leibniz moved with the books to Lein Street, and later to Schmiedestraße. Today, renovations are underway once again—the seat of the Lower Saxony State Parliament is getting a facelift.