Vahyazdâta: Persian nobleman who attempted a coup d'état in 521 BCE.
Immediately, new rebellions started, and while Darius was occupied in Babylonia and Media, Vahyazdâta proclaimed himself king, saying that he was the real Smerdis, and gained support in Persia. He was powerful enough to appoint a satrap to rule Arachosia (who was defeated by Darius' own satrap, Vivâna).
We do not know much about Vahyazdâta's background, but it is possible that he was, as a Persian nobleman, in the army of Cambyses when the latter died in July. It is possible that Vahyazdâta had a better claim to the throne than Darius (or thought so), and revolted against this new upstart king, who was not related to Cambyses.
Vahyazdâta was defeated by Darius' general Artavardiya on May 24 near Rakhâ (modern Behbehân), and a second time on July 14 near the mountain Parga (near the modern town Forg). The usurper was captured and crucified.
He is represented on Darius' monument at Behistun.