The Chapel of St John the Baptist (Capela de São João Batista) in Porto's Igreja de São Francisco. This lavishly decorated chapel within the main church predates much of the Baroque excess on display.
As with other chapels in the church this was funded by one of Porto's wealthy families during the 16th century as a pantheon. Built in the 1530s for the Carneiro family the chapel is in the Manueline style which is not seen as often in Porto. I would hazard a guess that the gold-gilt altarpiece is later - probably contemporary with the other carved wood in the main church.