The Gymnasium Theodorianum is a grammar school situated in the historic centre of Paderborn, Germany. Succeeding in the tradition of the cathedral school founded in 799, it is among the ten oldest schools in the world. It continues in the ideals of Renaissance humanism, with Latin taught as the primary foreign language and Ancient Greek offered as an additional subject. The school has produced several leading German political, scientific, religious and military figures. It is known locally simply as the “Theo”.