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Here's some graffiti from the alley-side wall of a church in Dubrovnik.
In Latin, it reads: Pax Vobis Memento Mori Qui Ludentis Pilla. (1597) (My photo cuts off "mori".)
Translated it means: Peace be with you. Remember that you will die, you who play here.
Presumably it's a warning to those who play in the alley, perhaps from someone at the church.