Johannes Aventinus (1477–1534) was a Bavarian historian. His real name was Johann Georg Turmair, and "Aventinus" is a latinization of his birthplace, Abensberg.
Aventinus, the name taken by Johannes Turmair, author of the Annales Boiorum, or Annals of Bavaria, from Aventinum, the Latin name of the town of Abensberg, where he was born on the 4th of July 1477.
Although Aventinus did not definitely adopt the reformed faith, he sympathized with the reformers and their teaching, and showed a strong dislike for the monks.
Aventinus, who has been called the "Bavarian Herodotus", wrote other books of minor importance, and a complete edition of his works was published at Munich (1881-86).