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He didn't. Islamization occurred AFTER 1500AD (the conquest of Constaninople).
https://en.wikipedia.org/wiki/Islam_...nd_HerzegovinaIslam was first brought to the Balkans by the Ottomans in the mid-to-late 15th century who gained control of most of Bosnia in 1463, and seized Herzegovina in the 1480s. Over the next century, the Bosnians - composed of dualists and Slavic tribes living in the Bosnian kingdom under the name of Bošnjani [5] - embraced Islam in great numbers under Ottoman rule which also saw the name Bošnjanin transform into Bošnjak ('Bosniak'). By the early 1600s, approximately two thirds of the population of Bosnia were Muslim.
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