Constantine I (Bulgarian: Константин I Konstantin I called Константин Тих Konstantin Tih (Tikh) which includes the shortened form of the name of his father as a patronymic) ruled as emperor (tsar) of Bulgaria from 1257 to 1277. He was the son of a nobleman from Skopie named Tihomir (Tih) and his maternal grandfather was Serbian Grand Prince Stefan Nemanja.
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