The Palazzo Arcivescovile (also known as Palazzo Patriarcale) contains several rooms of frescoes by the young Gianbattista Tiepolo, painted from 1726 to 1732, which comprise the most important collection of early works by Italy's most brilliant 18th-century painter. The Galleria del Tiepolo (1727) contains superlative Tiepolo frescoes depicting the stories of Abraham, Isaac, and Jacob. The Judgment of Solomon (1729) graces the Pink Room. There are also beautiful and important Tiepolo frescoes in the staircase, throne room, and palatine chapel of this palazzo. Even in these early works we can see the Venetian master's skill in creating an illusion of depth, not only through linear perspective, but also through subtle gradations in the intensity of the colors, with the stronger colors coming forward and the paler ones receding into space. Tiepolo was one of the first artists to use this method of representing space and depth, which reflected the scientific discoveries of perception and optics in the 17th century. In the same building, the Museo Diocesano features a collection of sculptures from Friuli churches from the 13th through the 18th century.