 The Chapel of Saint Peter ( Spanish : Capilla de San Pedro ) was built between 1615 and 1620 , and contains three highly decorated Baroque altarpieces from the 17th century . The altar at the back is dedicated to Saint Peter , whose sculpture <unk> over the altar . It is surrounded by early 17th century paintings relating to his life , painted by Baltasar de Echave <unk> . To the right is an altarpiece dedicated to the Holy Family , with two paintings by Juan de Aguilera of Florence called The Holy Family in the workshop of Saint Joseph and Birth of the <unk> . The altarpiece to the left of the main altarpiece is dedicated to Saint <unk> of Jesus whose image also appears in the chapel 's window . It includes four paintings on sheets of metal that depict scenes from the birth of Jesus . Five oil paintings illustrate scenes from the life of Saint <unk> , and above this is a semi @-@ circular painting of the coronation of Mary . All these works were created in the 17th century by Baltasar de Echave y <unk> . 
