Original: Events By Place Europe King Theuderic III of Neustria is defeated by Pepin of Herstal , Mayor of the Palace of Austrasia , at the Battle of Tertry near Péronne in modern France .
Simplified: Events December 15 - Sergius succeeds Conon as Pope King Theuderic III of Neustria is defeated by Pepin of Herstal , Mayor of the Palace of Austrasia .