Many temples and public buildings were built in Greece by emperors and wealthy Roman nobility, especially in Athens. Julius Caesar began construction of the Roman agora in Athens, which was finished by Augustus. The main gate, the Gate of Athena Archegetis, was dedicated to the patron goddess of Athens, Athena. The Agrippeia was built in the centre of the Ancient Agora of Athens by Marcus Vipsanius Agrippa. Emperor Hadrian was a philhellene and an ardent admirer of Greece and, seeing himself as an heir to Pericles, made many contributions to Athens. He built the Library of Hadrian in the city and completed the construction of the Temple of Olympian Zeus, some 638 years after its construction had been started by Athenian tyrants but ended because of the belief that building on such a scale would cause hubris. The Athenians built the Arch of Hadrian to honor Emperor Hadrian. The side of the arch facing the Athenian agora and the Acropolis had an inscription stating, "This is Athens, the ancient city of Theseus." The side facing the Temple of Zeus and the 'new city' (this was still part of the ancient city; e.g. the Panathenaic Stadium has always been on that side) had an inscription stating, "This is the city of Hadrian, and not of Theseus". Adrianou (Hadrian Street) exists to this day, leading from the arch to the Ancient Agora.