Of all the Hapsburg and Bourbon kings who ruled Spain, only two are missing (Felipe V is buried at La Granja de San Ildefonso, Ferdinand VI in Madrid).
Ferdinand VI is buried in Madrid and Felipe V is buried at La Granja de San Ildefonso.
At the base of the two northern pilasters, look closely at Lorenzo Maitani's marvelous carved marble bas-reliefs of scenes from the Old Testament and the Last Judgment.