During the Roman period not many changes were realized on the Acropolis. The only new monument was the Temple of Rome and Augustus. Furthermore, Nero placed big letters to honor himself in eastern entablature of the Parthenon where today many holes are visible, created from the metal letters. Also, a small repair took place in the western wall of the Erechtheum which had suffered damage from fire. On the contrary, in southern slope of the Acropolis, new buildings were added. The theatre of Dionyssos acquires a new, elegant stage from Nero who during his visit in Athens gave there a musical concert. The Odeum of Pericles that had been destroyed by the Athenians at the siege of Sylla so that the Roman general would not use the timber of its roof, is rebuilt. In the west Herode Atticus builds a luxury Odeum, the Herodeion which was, according to Pausanias, the most beautiful in Greece. Many renovations are also visible in most of the south slope's buildings. OLYMPIEION - GATE OF HADRIAN Emperor Hadrian visited Athens in 130-131 A.D. and he stayed for several months. His arrival was combined with a brilliant fact. He inaugurated the Temple of Zeus Olympios the construction of which he financed. Thus the temple was completed with a delay of approximately 600 years. The same period, the Athenians in order to honor the arrival of the emperor, they erected next to the Olympieion an arch, today known as the Gate of Hadrian. The Roman emperor also built more sanctuaries south of the Olympieion. The most important of these was the sanctuary of Zeus Panhellenios. ROMAN MARKET - LIBRARY OF HADRIAN The Roman Agora (Market of Caesar and Augustus) is located on the north side of the Acropolis, and a short distance to the east of the Greek Agora, with which it was connected by a paved street. An inscription (IG II2 3174) on the architrave of the monumental Gate of Athena Archegetis ("Athena the Leader") tells us that Julius Caesar and Augustus provided the funds for its construction in the 1st century B.C. The Roman Agora consists of a large, open-air courtyard surrounded by colonnades on all four sides. During the reign of Hadrian the court was paved with slabs. On the eastern side, there were also a series of shops. On the southern side was a fountain. The main entrance was on the west (Gate of Athena Archegetis), and there was a second entrance (or propylon) on the east, leading up to a public latrine and the "Tower of the Winds."