https://en.wikipedia.org/wiki/Crimean_Gothic
Attestation. The existence of a Germanic dialect in Crimea is noted in a number of sources from the 9th century to the 18th century. However, only a single source provides any details of the language itself: a letter by the Flemish ambassador Ogier Ghiselin de Busbecq, dated 1562 and first published in 1589, gives a list of some eighty words and a song supposedly in the language.