Philippe de Thaon
Born: 1100, France
Nationality: French
Philip de Thaun was the first Anglo-Norman poet. He is the first known poet to write in the Anglo-Norman French vernacular language, rather than Latin. Two poems by him are signed with his name, making his authorship of both clear. A further poem is probably written by him as it bears many writing similarities to his other two poems.
Philip's earliest work is a work on the calendar, which is called variously Comput, Cumpoz, Compuz, or Computus.
Read more at https://en.wikipedia.org/wiki/Philip_de_Thaun