Tattenai (or Tatnai or Sisinnes; Hebrew: תַּתְּנַי Tattǝnay; Akkadian: 𒋫𒀜𒄨𒉡 Tâttannu or 𒋺𒄨𒉡 Tattannu) was a Biblical character and was a Persian governor of the province west of the Euphrates River during the time of Zerubbabel and the reign of Darius I.
[1] He is best known for questioning King Darius in regard to the rebuilding of a temple for the Lord, God of Israel.
[2][3] In the letter, Darius asked that the people do everything they can to support this rebuilding financially, and that they do nothing to impede it lest they suffer harsh punishment.
A number of cuneiform tablets bearing the name Tattenai have survived as part of what may have been a family archive.
The tablet that links one member of this family to the Bible character is a promissory note dated to the 20th year of Darius I, 502 BC.