The Sala de los Abencerrajes (Hall of the Abencerrages) derives its name from a legend according to which the father of Boabdil, last king of Granada, having invited the chiefs of that illustrious line to a banquet, massacred them here. This room is a perfect square, with a lofty dome and trellised windows at its base. The roof is exquisitely decorated in blue, brown, red and gold, and the columns supporting it spring out into the arch form in a remarkably beautiful manner. Opposite to this hall is the Sala de las dos Hermanas (Hall of the two Sisters), so-called from two very beautiful white marble slabs laid as part of the pavement. These slabs measure 50 by 22 cm (15 by 7½ in), and are without flaw or stain. There is a fountain in the middle of this hall, and the roof —a dome honeycombed with tiny cells, all different, and said to number 5000— is a magnificent example of the so-called "stalactite vaulting" of the Moors.