Gregory of Nin
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Gregory of Nin (Grgur Ninski) was a 10th-century bishop that strongly opposed the Pope and official circles of the Church and introduced the Croatian language in the religious services after the Great Assembly in 926. Until that time, services were held only in Latin, not being understandable to the majority of the population. Not only that this was important for Croatian language and culture but it also made the religion stronger within the Croatian nation.