Anthropodermic bibliopegy performed, or collected by medical doctors, who have access to cadavers, sometimes those of executed criminals, such as the case of John Horwood in 1821 and the Red Barn Murder in 1828. Another tradition, with less supporting evidence, is that books of erotica or the occult have been bound in human skin. The Royal College of Surgeons of Edinburgh preserves a notebook bound in the skin of the murderer William Burke after his execution and subsequent public dissection by Professor Alexander Monro in 1829. What Lawrence Thompson called "the most famous of all anthropodermic bindings" is exhibited at the Boston
Edinburgh and Mr Hyde", and murderers Burke and Hare who delivered fresh corpses for dissection to the famous anatomist Robert Knox. Another well-known Edinburgh resident was Greyfriars Bobby. The small Skye Terrier reputedly kept vigil over his dead master's grave in Greyfriars Kirkyard for 14 years in the 1860s and 1870s, giving rise to a story of canine devotion which plays a part in attracting visitors to the city. The City of Edinburgh has entered into 14 international twinning arrangements since 1954. Most of the arrangements are styled as 'Twin Cities' but the agreement with Kraków is designated as a 'Partner