Ethnic structure of Crimea 1725 - 2001:
^^^
Most of the "Others" before 1850 were Crimean Greeks AFAIK (now they are called Mariupol Greeks):
https://en.wikipedia.org/wiki/Mariupol_Greek
https://en.wikipedia.org/wiki/Crimean_Tatars
^^^
Ethnic history of Crimea until the emergence of Crimean Tatars (video + timeline):
Timeline:
The oldest known inhabitants were Taurians (Tauri) -
https://en.wikipedia.org/wiki/Tauri
1000 BC - Tauri and Cimmerians inhabit Crimea
600 BC - Tauri and Scythians inhabit Crimea
500 BC - Tauri, Greek settlers and Scythians
480 BC - Tauri, Bosporan Greeks and Scythians
200 BC - Bosporan Greeks, Tauri, Scythians and Sarmatians
109 BC - Bosporan Greeks (vassals of Pontic Greeks), Scythians, Sarmatians
63 BC - Bosporan Greeks (vassals of Rome), Scythians and Sarmatians
250 AD - Bosporan Greeks, Scythians and Sarmatians
300 AD - Bosporan Greeks and Ostrogoths
375 AD - Hunnic Empire conquers Crimea
453 AD - Goths regain independence, Byzantines liberate Bosporan Greeks
650 AD - Bulgars subjugate Crimean Goths
750 AD - Khazar Empire conquers most of Crimea
965 AD - East Slavs form the Principality of Timutarakan in eastern Crimea
988 AD - Principality of Timutarakan captures Chersonesus, but gives it back
1000 AD - Pechenegs conquer northern parts of Crimea
1036 AD - Pechenegs defeated by Kievan Rus, north Crimea captured by Cumans
1083 AD - Byzantine Crimeans conquer the Slavic Principality of Timutarakan
1200 AD - north Crimea (Steppes) ruled by Cumans, southern by the Byzantines
1204 AD - Byzantine Crimean territories are now ruled by the Empire of Trebizond
1238 AD - Mongol Golden Horde invades northern Crimea and defeats the Cumans
1266 AD - Genoese Italians buy the city of Caffa (Feodosia) from the Mongol Khan
1313 AD - Golden Horde's Khan converts to Islam - Islam spreads into Crimea
1330 AD - Principality of Theodoro gains independence from the Empire of Trebizond
1400 AD - Crimea invaded by Tamerlan (Timurids), Genoa captures Greek cities
1449 AD - Independent Crimean Khanate emerges in former Golden Horde areas
1475 AD - Turkey invades southern Crimea, conquering Theodoro and Genoese lands
Video:
https://www.youtube.com/watch?v=f0-fLgWoxIY