Claim: Jean Casimir Félix Guyon, born on July 21, 1831, in Saint-Denis, Ile-Bourbon, a French surgeon and urologist, studied medicine in Paris (the capital and most populous city of France), receiving his doctorate in 1858.
Evidence: Jean Casimir Félix Guyon (21 July 1831 – 2 August 1920) was a French surgeon and urologist born in Saint-Denis, Ile-Bourbon (Réunion). He studied medicine in Paris, receiving his doctorate in 1858. Paris (French pronunciation: ​[paʁi (listen)) is the capital and most populous city of France, with an estimated population of 2,148,271 residents as of 2020, in an area of 105 square kilometres (41 square miles).