Carmen Mauri, known in English as the Song of a Maur, is an anonymous Polish medieval poem written in Latin. It tells the story of Polish nobleman and magnate Piotr Włast (Peter Wlast) and his rebellion against Duke Władysław II the Exile. The poem has survived only in fragmentary form. Its author and exact date of creation is unknown, it is presumed that the author was a Benedictine monk and the poem was written between the second half of the 12th century and the beginning of the 14th century.