noble. This story and a 1849 painting depicting it by have become relevant recently. This nineteenth-century painting shows Dürer painting a mural at St. Stephen's Cathedral, Vienna. Apparently, this reflects a seventeenth-century "artists' legend" about the previously mentioned encounter (in which the emperor held the ladder) – that this encounter corresponds with the period Dürer was working on the Viennese murals. In 2020, during restoration work, art connoisseurs discovered a piece of handwriting now attributed to Dürer, suggesting that the Nuremberg master had actually participated in creating the murals at St. Stephen's Cathedral. In the recent 2022 Dürer exhibition in Nuremberg (in which the drawing technique is also traced and connected to Dürer's other works), the identity of the commissioner is discussed. Now the painting of Siegert (and the legend associated with it) is used as evidence to suggest that this was Maximilian. Dürer is historically recorded to have entered the emperor's service in 1511, and the mural's date is calculated to be around 1505, but it is possible they have known and worked with each other earlier than 1511. Cartographic and astronomical works Dürer's exploration of space led to a relationship and cooperation with the court astronomer Johannes Stabius. Stabius also often acted as Dürer's and Maximilian's go-between for their financial problems. In 1515 Dürer and Stabius created the first world map projected on a solid geometric sphere. Also in 1515, Stabius, Dürer and the astronomer Konrad Heinfogel produced the first planispheres of both southern and northerns hemispheres, as well as the first printed celestial maps, which prompted the revival of interest in the field of uranometry throughout Europe. Journey to the Netherlands (1520–1521) Maximilian's death came at a time when Dürer was concerned he was losing "my sight and freedom of hand" (perhaps caused by arthritis) and increasingly affected by the writings of Martin Luther. In July 1520 Dürer made his fourth and last major journey, to renew the Imperial pension Maximilian had given him and to secure the patronage of the new emperor, Charles V, who was to be crowned at Aachen. Dürer journeyed with his wife and her maid via the Rhine to Cologne and then to Antwerp, where he was well received and produced numerous drawings in silverpoint, chalk and charcoal. In addition to attending the coronation, he visited Cologne (where he admired the painting of Stefan Lochner), Nijmegen, 's-Hertogenbosch, Bruges (where he saw Michelangelo's