90 Aemilianus van Heel (1907–1938) a Franciscan friar who served as a missionary in China Marinus van der Lubbe (1909–1934) executed for the Reichstag fire in Berlin in 1933 Buurtpoes Bledder (2011–2013) a male domestic cat, media star for his exploits in the city Kirtie Ramdas (born 1980), Dutch television presenter and actress International relations Twin cities – sister cities Leiden is twinned with: Miscellaneous The coat of arms of Leiden is two red keys, crossed in an X-shape on a white background. These keys are the Keys of Heaven held by St. Peter, for whom a large church in the city centre is named. Because of this coat of arms, Leiden is referred to as the "Sleutelstad" ("the key city"). For a time Leiden held the title "The Coldest Place on Earth" because of the developments in cryogenics in a laboratory there. Heike Kamerlingh Onnes (1913 Nobel prize winner in physics) liquefied helium for the first time (1908), and later managed to reach a temperature of less than one degree above Absolute zero. The Norwegian cheese "nøkkelost" ("key cheese") is named after the keys in coat of arms of Leyden, as it is a variation of Leyden cheese. The following places and things are named after this city: Leyden, New York, USA Leyden, Massachusetts, USA Leyden Township, Cook County, Illinois, USA Leiden scale, for measuring extreme low temperatures. Factor V Leiden is named after the city of Leiden where it was discovered in 1994. The Leyden jar, a capacitor made from a glass jar, was invented here by Pieter van Musschenbroek in 1746. It was actually first invented by Ewald Georg von Kleist the year before, but the name "Leyden jar" stuck. Leiden's Stadhuis (Town Hall) has a poem in the form of a cryptogram on its façade that records the date 1574 in Roman numerals, the year of the "Black Famine" or Spanish siege (W equals two Vs): (Dutch: "When the Black Famine had brought to the death nearly six thousand persons, then God the Lord repented, and gave bread again as much as we could wish".) Sports Zorg en Zekerheid Leiden is the basketball club of Leiden. In 2011, 2013 and 2021 they won the National Title, in 2010 and 2012 the National Cup and in 2011 and 2012 the National Super Cup. The club also played in the FIBA EuroChallenge and reached the Second Round (Best