El Escorial - Monasterio de San Lorenzo del Escorial Library

On the south side of the Patio de los Reyes, on the second floor, is the Library. Decorated with fine frescoes by Tibaldi depicting "The Foundations of Learning", it contains more than 40,000 volumes. Some of its most valuable incunabula, notably the Codez Aureus (1093) attributed to the German Emperor Conrad II, are displayed in cases, together with a manuscript of Alfonso the Wise's "Hymns to the Virgin", manuscripts in the hand of Santa Teresa of Ávila and Hebrew and Arabic writings.