British diplomat, travel writer & the authority on the Ottoman Empire Sir Paul Rycaut (1629 - 1700) wrote about recently islamized Croats of Bosnia who still "read The gospel in Croatian langauge, obtaining it from Moravia & neighboring Dubrovnik"

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These people were known among their ethnic brethern who stayed completely loyal to their old Catholic-Christian faith as "poturi" ("half-turkified") or "poluvirci" ("half-faithful" (Croatian author Kašić used that term))

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In order to adapt themselves to their new Muslim co-believers, "poturi" slowly abandoned their old traditions.

The first sign of this was when they started to write Croatian texts in Arabic script, like
Hirvat türkisi (Croat folk song)

https://twitter.com/HCroats/status/1309032638255116292?s=20

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language*