The Zealots were a Jewish political movement in the 1st century AD which sought to incite the people of Iudaea Province to rebel against the Roman Empire and expel it from the country by force of arms during the Great Jewish Revolt (AD 66-70). When the Romans introduced the imperial cult, the Jews had rebelled and been put down. The Zealots continued to oppose the Romans, on the grounds that Israel belonged only to a Jewish king descended from David, see Jewish Messiah.

Josephus' Jewish Antiquities book 18 states that there were three main Jewish sects at this time, the Pharisees, the Sadducees, and the Essenes. The Zealots were a “fourth sect”, founded by Judas of Galilee (also called Judas of Gamala) and Zadok the Pharisee in the year 6 against Quirinius' tax reform, shortly after the Roman state declared what had most recently been the territory of the tribe of Judah a Roman Province, and that they “agree in all other things with the Pharisaic notions; but they have an inviolable attachment to liberty, and say that God is to be their only Ruler and Lord.” (18.1.6) According to the Jewish Encyclopedia article on Zealots[1]: “Following Josephus (”B. J.“ ii. 8, § 1; ”Ant.“ xviii. 1, §§ 1, 6), most writers consider that the Zealots were a so-called fourth party founded by Judas the Galilean (see Grätz, ”Gesch.“ iii. 252, 259; Schürer, ”Gesch.“ 1st ed., i. 3, 486). This view is contradicted, however, by the fact that Hezekiah, the father of Judas the Galilean, had an organized band of so-called ”robbers“ which made war against the Idumean Herod (”B. J.“ i. 10, § 5; ”Ant.“ xiv. 9, § 2), and also by the fact that the system of religious and political murders practised by the Zealots was in existence during the reign of Herod, if not long before (see below).”

In either case, it has been argued that the group was not so clearly marked out (before the first war of 66-70/3) as some have thought (see Richard Horsley's “Bandits, Prophets, and Messiahs” and Tom Wright's “The New Testament and the People of God”).

The Zealots had the leading role in the Jewish Revolt of 66. They succeeded in taking over Jerusalem, and kept control of it until 70, when the son of Roman emperor Vespasian, Titus Flavius, retook the city and destroyed Herod's Temple during the destruction of Jerusalem.

The Zealots objected to Roman rulership and sought to violently eradicate it; Zealots engaged in violence were called the Sicarii. They raided Jewish habitations and killed Jews they considered collaborators, they also urged Jews to fight Romans and other Jews for their religiopolitical cause. Josephus paints a very bleak picture of their activities as they instituted what he characterized as a murderous “reign of terror” prior to the Jewish Temple's destruction.

According to Josephus, the Zealots followed John of Gischala, who had fought the Romans in Galilee, escaped, came to Jerusalem, and then inspired the locals to a fanatical position that led to the Temple's destruction.