Probably a native of Hornaim in the land of Moab, and a great enemy of the Jews. He may have received from the Persian government some authority over the Samaritans of imported Cuthites, as one of the governors west of the Euphrates. When Nehemiah came from Shushan to Jerusalem, Nehemiah 2:10,19, B. C. 454, and began to rebuild the walls of Jerusalem, Sanaballat, Tobiah, and Geshem taunted him, and sent to inquire on what authority he undertook this enterprise, and whether it were not a revolt against the king. Nehemiah nevereless proceeded with vigor in his undertaking, and completed the walls of the city, Nehemiah 2:10 4:6.

Nehemiah being obliged to return to king Artaxerxes at Shushan, Nehemiah 13:6, B. C. 441, in his absence the high priest Eliashib married his grandson Manasseh son of Joiada to a daughter of Sanballat and allowed Tobiah, a kinsman of Sanballat, an apartment in the temple. Nehemiah, on his return to Jerusalem, (the exact year of which is not known,) drove Tobiah out of the temple, and would not suffer Manasseh the high priest's grandson to continue in the city, nor to perform the functions of the priesthood. Manasseh being thus expelled retired to his father-in-law Sanballat, who provided him the means of exercising his priestly office on Mount Gerizim. See GERIZIM and SAMARITANS.