Translated as “Blessed Offspring”, this single voice conductus is attributed to the 13th century composer Perotin. The Latin poet Philippe the Chancellor wrote the words and it is thought that Perotin could not have composed the monophonic piece until at least c.1220.
The song is described as a Marian piece, which was to be used at Mass during the Communion. It is still performed today and has appeared on numerous recordings by many early music ensembles. The composers William Byrd and Giovanni Palestrini also wrote works with the same name. William Byrd used the text to translate it into a sacred motet.
Trio Mediaeval recordings
ECM New Series B0005057-02 (CD: Stella Maris)