 It takes its name from the statues of <unk> royalty which form part of its decoration , and is the oldest work in churrigueresque style in Mexico , taking 19 years to complete . At the bottom , from left to right , are six female royal saints : Saint Margaret of Scotland , Helena of Constantinople , Elisabeth of Hungary , Isabel of Portugal , Empress <unk> and Edith of <unk> . In the middle of the altar are six <unk> kings , four of whom are : <unk> a <unk> martyr , Henry II , Holy Roman Emperor , Edward the <unk> and Casimir of Poland . Above these four are Saints Louis of France and Ferdinand III of Castile . In between these kings an oil painting of the <unk> of the <unk> by Juan Rodriguez Juarez shows Jesus as the King of kings . The top portion features a painting of the Assumption of Mary as celestial queen flanked by oval bas reliefs , one of Saint Joseph carrying the infant Jesus and the other of Saint Teresa of <unk> with a <unk> in her hand and the Holy Spirit above her , inspiring her to write . Above this are figures of Jesus and Mary among sculptures of angels crowned with an image of God , the Father . 
