Dionysius Cato's Catho moralizatus alias Speculum regiminis (Lyons, Jean de Vingle, 1498), also known as 'Disticha de moribus', is a collection of Latin proverbs or moral maxims attributed to Theobald of Chelsea, a 12th-century scholar. It consists of short, two-line verses (distichs) that provide advice on proper conduct, ethics, and the virtues that one should pursue in life. These proverbs were intended to guide people in leading a moral and virtuous life. The book was the most popular book in the Middle Ages.