For another biography, under the same title, see Thegan of Trier.
Vita Hludovici or Vita Hludovici Imperatoris is a biography of Louis the Pious, Holy Roman Emperor and King of the Franks from 814 to 840. The work was written in Latin in or soon after 840 by an author whose real name is unknown. He is conventionally called Astronomus ,the Astronomer or the Limousin Astronomer, due to his many detailed comments on astronomical matters.
