This impressive mansion, a symbol of the city's power in the 16th and 17th centuries, served as an exchange and as the seat of St. George and the brotherhoods of rich patricians. Founded as a meeting place for merchants and dignitaries, it was named after King Arthur, of round table fame, and hosted many a noble guest. Following a fire in 1841, it was given a more Gothic form, complete with ostentatious sculptures and paintings illustrating man's merits and vices. Inside, the centrepiece of the main hall is a 10.64-metre renaissance tiled stove dating to 1546, made of more than 500 individual tiles and the tallest of its kind in Europe. Its adornments portray leaders, coats of arms and allegorical figures. Just to the left is a small pewter surface that claims to be the oldest table in Poland. Two stone lions protect the entrance to the cellars of the court. Try to pick up one of the different language cards that are lying around.