Herzogtum Ratibor
In foreign policy, Jan became a faithful ally of the House of Luxembourg. On 24 February 1327, together with the other Piast Dukes, Jan paid homage to King John of Bohemia in Opawa. In 1336, Jan was forced to accept the annexation of the Duchy of Racibórz to the Přemyslid Duchy of Opawa.