Sas was, according to the Slavo-Romanian chronicles, the second voivode of Moldavia (c. 1353/1360-c. 1357/1364). He followed Dragoş who had been sent to Moldavia as a representative of the king of Hungary.
According to the sequence of the voivodes listed in the Slavo-Romanian chronicles, he was followed by Bogdan (who would become the first independent ruler of Moldavia), but several historians (e.g., Alexandru Dimitrie Xenopol, Ştefan Pascu) consider Balc as his successor.
The Drágfi of Béltek family, whose estates would encompass over a hundred villages in the Kingdom of Hungary,
Köpeczi, Béla (General Editor) – Makkai, László; Mócsy, András; Szász, Zoltán (Editors) – Barta, Gábor (Assistant Editor): History of Transylvania - Volume I: From the beginnings to 1606; Akadémiai Kiadó, 1994, Budapest; ISBN 963-05-6703-2
Spinei, Victor: Moldavia in the 11th-14th Centuries; Editura Academiei Republicii Socialiste Româna, 1986, Bucharest