Darius is mentioned 1 time in scripture, across 1 book of the Old Testament. First named in scripture around 0 AD.
Darius the Persian (Neh. 12:22) was probably the Darius II. (Ochus or Nothus) of profane history, the son of Artaxerxes Longimanus, who was the son and successor of Ahasuerus (Xerxes). There are some, however, who think that the king here meant was Darius III. (Codomannus), the antagonist of Alexander the Great (B.C. 336-331).