Vékony, Gábor (2000). Dacians, Romans, Romanians. Internet Archive. [Hamilton, Ont.; Buffalo, N.Y.] : Matthias Corvinus. p. 66. ISBN978-1-882785-13-1. ...it becomes evident that, behind King Diegis (and High Priest?) stood Decebal, who did not use the royal title but held the actual power.