This tile artwork, represents the oil painting of Saint Peter, created by the portuguese Renaissance painter, Vasco Fernandes, a.k.a Grão Vasco. It has been reconstructed due to a vandalism act, that is why the face looks a bit diferent.
The original painting can be seen at the museum in the historical part of the city. Which is of course named Museum Grão Vasco :)
"Glory to Grão Vasco" is what says under the tile.
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