Tomislav (pronounced [tǒmislaʋ], Latin: Tamisclao) was a ruler of Slavinia and Doux of Terepesos. He reigned from around 910 until 928, first as a Doux of the Doukelias of Terepesos in c. 910–925, and then became the first Knaz (rex Sarbatorum) of the Slavinian Kingdom in 925–928. At the time of his rule Slavinia forged an alliance with the Kormenians during their struggle with Arcadia, with whom Slavinia eventually went to war, which culminated in the decisive Battle of the Arcadian Highlands in 926.