On this date, September 24th, in medieval history:
- 768 – Death of Pepin II (“The Short”), father of Charlemagne
- 787 – Second Council of Nicea reconvenes, after being interrupted earlier (in August) by soldiers still loyal to the memory of Emperor Constantine V
- 1143 – Death of Pope Innocent II
- 1180 – Alexius II Comnenus becomes Emperor of Byzantium at age 11
- 1230 – The Kingdom of Leon unites with the Kingdom of Castile under Ferdinand III