sentences:  Ottaviano Petrucci published it in his first book of masses in 1502, one of the first books of music ever to be printed, which shows its importance and influence; indeed it was widely transmitted, in many other sources, in the early 16th century.The mass may have been written during Josquin's Roman period, for example between 1490 and 1493, while Josquin was singing in the Sistine Chapel choir.Its contrapuntal sophistication, as well as circumstantial evidence suggesting who the aristocrat may have been, perhaps indicate the later date.