Nicaea (also spelled Nicæa or Nicea, ny-SEE-ə; Latin: [niːˈkae̯.a]), also known as Nikaia (Ancient Greek: Νίκαια, Attic: [nǐːkai̯a], Koine: [ˈnikεa]), was an ancient Greek city in the north-western Anatolian region of Bithynia. It was the site of the First and Second Councils of Nicaea (the first and seventh Ecumenical councils in the early history of the Christian Church), the Nicene Creed (which comes from the First Council). It was also the capital city of the Empire of Nicaea following the Fourth Crusade in 1204, until the recapture of Constantinople by the Byzantines in 1261.
https://en.wikipedia.org/wiki/Nicaea