The Library Courtyard was a large peristyle next to which were located the Imperial Triclinium, Hospitalia, Imperial Palace, Heliocaminus Baths, Maritime Theater, and the Greek and Latin Libraries. The colonnades consisted of 19 columns on the long sides (66 m) and 14 on the short sides (51 m). In the center of the northern colonnade was a nymphaeum (1) that survived from the republican villa, as does the courtyard itself.