He also built a stoa on the Athenian acropolis. The Stoa of Attalos houses the Museum of the Ancient Agora. The new agora included a monumental ionic stoa and a sumptuous hall of unknown function. The basilica was in the Latin West equivalent to the Stoa in the Greek East. The hippodrome and later stadium were located east of the Echo Stoa. Herod's Royal Stoa stood atop this southern extension. The tessellated pavement and stoa were added in 1909. His sarcophagus is listed as standing in a "stoa" there by Constantine Porphyrogenitus. The temple was bounded by a stoa to the east. Only Roman texts from the Late Stoa survive. The northern stoa seems to have been the site of the Library of Pergamon. The stoa leads off north-east from the main sanctuary. Sometimes Stoicism is therefore referred to as "The Stoa", or the philosophy of "The Porch". The lowest level supports the remains of a stoa. The stoa was attached to the existing Polygonal Wall.