Passage: Jean-Baptiste Bessières, 1st Duc d' Istria (6 August 1768 – 1 May 1813) was a Marshal of France of the Napoleonic Era. His younger brother, Bertrand, followed in his footsteps and eventually became a divisional general. Their cousin, Géraud-Pierre-Henri-Julien, also served Napoleon I as a diplomat and Imperial official.

Question: What was the title of Jean-Baptiste Bessières?
Marshal