The Aramaic term segan (סגן) or segan hakohanim (Hebrew: סגן הכהנים) in the Talmud is the title for a Jewish Priest of the Temple in Jerusalem.
The form segan is Aramaic (סְגַן), appearing 5 times in the Hebrew Bible in the Aramaic sections of the Book of Daniel to refer to officers of the Babylonian government. The Hebrew form sagan (סָגָן) occurs a further 17 times in Nehemiah and elsewhere, again to refer to officials of the Babylonian rulers.
According to the Talmud the deputy was appointed to the position of the segan ha-kohanim with the responsibility of overseeing the actions of the work of the Temple's priests' staff, as well as a stand-in position, ready to take the role of High Priest in case he will be found unfit to serve the holy work on the temple, and thus, the Segan was only second to the High Priest, as Rabbi Hanina Segan ha-Kohanim (40 – 80 CE) attests:
"R. Hanina the Segan of the priests said: Why a 'Segan' [Deputy] is ever appointed ? In case the high-priest became unfit for service, the 'Segan' [Deputy] should enter at once to do the service".;
Many times the title commonly appears on the classical texts as ha-Segan ("the Deputy"), instead of the full title of Segan ha-Kohanim', for example on the Mishnah, in an halakha that deals with the work of the High Priest on Yom Kippur:
"...The deputy and the high priest put their hand into the urn. If the lot [‘For the Lord’] comes up in the hand of the high priest, the deputy said to him: Sir high
priest, raise thy hand! And if it came up in the right hand of the deputy, the head of the
One can also note the importance given to the matter in the ritual ceremony of "Nichum Aveilim" (consoling the mourners of the deceased), in which the High Priest takes part in:
"When he passes along the row to comfort others, the Segan and the former High Priest stand on his right; whilst the Rosh-Beth-Ab, the mourners and all the people are on his left. And when he stands in the row to be comforted by others, the Segan is stationed on his right and the Rosh Beth Ab and all the public on his left."
Two out of three most prominent Segans are noted on the Talmud and on Josephus Flavius' work: Hanina Segan ha-Kohanim, and Eleazar ben Hanania (son of Hananiah b. Hezekiah b. Garon who served as High Priest).