This was a super interesting read. Serendipitously, I’m reading the book Genghis Khan and the Making of the Modern World which mentions that when Austrians captured a scouting Mongolian party outside Vienna during the largest extension of Mongolian invasion into Europe, one of them turned out to be an Englishman! There’s even a book about him: https://www.amazon.com/dp/184212210X. See this SE History question and answers to Lear more: https://history.stackexchange.com/questions/43967/who-was-th...

If you are interested in this topic, there is a great book on it called The Tartar King's Englishman.

https://www.amazon.com/Tartar-Khans-Englishman-Gabriel-Ronay...