Ad Petri Cathedram (Ecclesiastical Latin: [ad ˈpetri ˈkatedram]; "To the Chair of Peter") was the first encyclical issued by Pope John XXIII on 29 June 1959. It was promulgated eight months into the pontificate and addresses truth, unity and peace in the spirit of charity. The document makes several references to the planned Second Vatican Ecumenical Council later held during 1962–1965. It was neither a trend-setting social document or doctrinal exposition, but instead a fatherly message which was seen as addressing its issues with warmth and pastoral concern.