I believe the 13th century conquest would have been the Mongolian Empire. While Constantinople fell in 1204, Crimea devolved to the Empire of Nicaea [1] or Treb

I believe the 13th century conquest would have been the Mongolian Empire. While Constantinople fell in 1204, Crimea devolved to the Empire of Nicaea [1] or Trebizond [2]. In 1223, the Mongols conquered most of Crimea [3]. [1] https://en.wikipedia.org/wiki/Byzantine_Empire#Crusader_sack_of_Constantinople_.281204.29 https://en.wikipedia.org/wiki/Byzantine_Empire#Crusader_sack... [2] https://en.wikipedia.org/wiki/Alexios_I_of_Trebizond https://en.wikipedia.org/wiki/Alexios_I_of_Trebizond [3] https://en.wikipedia.org/wiki/Crimea#Medieval_history https://en.wikipedia.org/wiki/Crimea#Medieval_history