Wikipedia, 18 June 2015 (Blondel de Nesle; either John I of Nesle (ca. 1155-1202) or his son Jean II of Nesle (died 1241); French trouvère. The name Blondel de Nesle is attached to about 25 courtly songs)
Encyclopaedia Britannica online, 18 June 2015 (Blondel de Nesle, (flourished 12th century), early lyric poet-musician, or trouvère, of northern France. Nothing is known about Blondel outside of his poetry. He was probably from Nesle, in Picardy, but the name Blondel may be a nickname, and it is uncertain how many of the 25 songs attributed to him are actually his.)