Altar of Caesareum
Begun by Cleopatra VII as a tribute to Marc Antony and completed by Augustus to honor Divus Julius Caesar.  Augustus adorned the site with two obelisks originally set up by Tethmosis III at Heliopolis.  One was removed in 1877 to London the other in 1879 to New York Central Park.  With the adoption of Christianity, it became the Cathedral of Alexandria in the 4th century AD and may have been the site of the brutal murder of Hypatia (c.370-415), a brilliant woman philosopher and victim to the political jealousy which prevailed at that time.  Nothing of the structure remains.
Milne 2251 Antoninus Pius
Curtis(1990) p. 300 coin 299