The stained glass windows of Notre-Dame, particularly the three rose windows, are among the most famous features of the cathedral. The west rose window, over the portals, was the first and smallest of the roses in Notre-Dame. It is 9.6 metres (31 ft) in diameter, and was made in about 1225, with the pieces of glass set in a thick circular stone frame. None of the original glass remains in this window; it was recreated in the 19th century.The two transept windows are larger and contain a greater proportion of glass than the rose on the west façade, because the new system of buttresses made the nave walls thinner and stronger. The north rose was created in about 1250, and the south rose in about 1260. The south rose in the transept is 12.9 metres (42 ft) in diameter; with the claire-voie surrounding it, a total of 19 metres (62 ft). It was given to the cathedral by King Louis IX of France, known as Saint Louis.