... Sounds like the work of O' Munaciello... just any Neapolitan:
"The story of ‘o Munaciello, is one of the most famous legends in Napoli, and one of the most interesting. In Neapolitan dialect, ‘o Munaciello means The Little Monk. This little monk can be nice and hide money somewhere within a person’s house or play harmless jokes. The monk can also be cruel; breaking plates, whispering non-sensical phrases in people’s ears while they sleep, or hiding household objects."