In the 15th century the dome was added and the naves extended back of the choir, uniting the building to the tower and forming a main entrance. Archbishop Luis Alfonso de los Cameros began the building of the main chapel in 1674; the walls were decorated with marbles and bronzes in the Baroque style of that period. At the beginning of the 18th century the German Conrad Rudolphus built the façade of the main entrance. The other two doors lead into the transept; one, that of the Apostles in pure pointed Gothic, dates from the 14th century, the other is that of the Palau. The additions made to the back of the cathedral detract from its height. The 18th-century restoration rounded the pointed arches, covered the Gothic columns with Corinthian pillars, and redecorated the walls.