The Arch of Hadrian in Athens is a triumphal arch which lies in proximity to Syntagma Square, right between the Acropolis and the Temple of Olympian Zeus. On the northwest, this monument faces the Monument of Lycicrates in Plaka. The construction of this temple started in 131 AD when the people wanted to celebrate the arrival of the Roman Emperor Hadrian and thank him for his benefactions to the city. The architect and builders of the arch are unknown to this day. Its location is not random, but rather symbolic. In fact, it was strategically selected to mark the line between the ancient part of Athens and Hadrian's new city.