Livio Celiano was the pen name of Don Angelo Grillo O.S.B. (1557–1629) an Italian early baroque poet whose madrigal texts were set by Monteverdi, Orazio Vecchi, Luca Marenzio, Salamone Rossi and others.[1]
The close relationship between Grillo and Monteverdi appears in their correspondence, which began about 1610 and continued until the poet's death in 1629.[2]