Pergamum

Pergamon or Pergamum (Greek: Πέργαμος, modern day Bergama in Turkey, ) was an ancient Greek city, in Mysia, north-western Anatolia, 16 miles from the Aegean Sea, located on a promontory on the north side of the river Caicus (modern day Bakırçay), that became an important kingdom during the Hellenistic period, under the Attalid dynasty, 281–133 BC.
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Noun
1. an ancient Greek city located in the western part of what is now modern Turkey; the technique of preparing sheepskins as parchment was developed here
(hypernym) city, metropolis, urban center
(part-holonym) Turkey, Republic of Turkey

In the Revised Version for Pergamos. (Revelation 1:11) Pergamum is the form usual in the classic writers.