The largest pre-WW1 plane – Sikorsky’s S-22 ‘Ilya Muromets’ – made its maiden flight Feb 12, 1914

Igor Sikorsky flew it personally from Petersburg to his native Kiev setting several world records.

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The relics of the Kiev Rus warrior – Ilya Muromets – are kept in Kiev Cave Monastery / Pechersk Lavra these days

https://en.wikipedia.org/wiki/Sikorsky_Ilya_Muromets