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It was first documented circa 240 AD and extended and repaired ever since, since invading armies kept attacking. What you see now is only the 15th century citadel, the inner bastion of an extensive fortified city.
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Surp Krikor Lusavoriç Ermeni Kilisesi
This Armenian Church was founded in 1191; the present building is 19th century and has been still in use for services.