An İstanbul court ruled on Friday for the arrest of one of the two historians for whom detention warrants were issued for insulting the founder of the Republic of Turkey, Mustafa Kemal Atatürk, Doğan News Agency has reported.

The court arrested historian Süleyman Yeşilyurt on charges of “insulting the memory of Atatürk” and “inciting people to hatred and hostility.”

Yeşilyurt turned himself in early on Friday after the warrant was issued, and reportedly denied the insult accusations.

Istanbul chief public prosecutor issued the detention warrants for Yeşilyurt and Hasan Akar for their comments about Atatürk on a TV program.

Yeşilyurt stated on a private broadcaster, TVnet, that one of Atatürk’s foster children, Afet İnan, was actually his illegitimate wife.