The Vita Dagoberti ('Life of Dagobert')[1] is an anonymous Latin biography of Dagobert III, king of the Franks (711–716). It is unreliable as a historical source. Confusing Dagobert III and the assassinated Dagobert II, the author mistakenly treats Dagobert III as a Christian martyr. The Vita is thus a saint's life, although its subject was not a saint.