In Greta Gerwig’s 2017 film Lady Bird, Saoirse Ronan’s character Lady Bird is vexed to discover that she’s been cast as “The Tempest” in William Shakespeare’s The Tempest. In other words, Medina is the titular town of the duke—and the Duke of Medina is the titular duke of the town. Lady Bird is the eponymous teenager of the film Lady Bird. You might call Ford Motor Company “Henry Ford’s eponymous business,” or mention that Lady Bird is a hilariously relatable character in her eponymous movie. If you’ve been led to believe that titular isn’t a synonym for eponymous, it’s probably because titular has more than one meaning.