Findings:

• Pietro Angelo Secchi
• Pietro d'Apone
• Pietro Bembo
• Pietro Mascagni
• pietro (user)
• Pietro Belluschi
• Pietro Aretino
• Pietro Tullio
• Pietro Antonio Cataldi
• Pietro Aldobrandini
• Pietro Lorenzini (user)
• Pietro Lombardo

If you Log in you could create a "Pietro and Ambrogio Lorenzetti" node. If you don't already have an account, you can register here.