Quarters and suburbs of Constantinople

thumb|300px|A view of Galata (modern Karaköy) with the [[Galata Tower (1348) at the apex of the medieval Genoese citadel walls, which were largely demolished in the 19th century to enable northward urban growth.]]

thumb|Map of Byzantine-era Constantinople showing Blachernae at the top

Hieria (in Greek variously ), also known as Heraeum or Heraion (Ἡραῖον), modern Fenerbahçe, was a town of ancient Bithynia and a suburb of Byzantine-era Constantinople (modern Istanbul, Turkey). It is prominent in the city's history as the site of an imperial palace.