The Essenes were one of the three major Jewish sects of the Second Temple period — alongside the Pharisees and the Sadducees. Where the Pharisees engaged actively with Jewish society and the Sadducees controlled the Temple hierarchy in Jerusalem, the Essenes had largely withdrawn from mainstream Jewish life, which they regarded as corrupted and impure. They established communities — the most famous at Qumran, near the northwestern shore of the Dead Sea — where they could live according to their strict interpretation of Jewish law and await the imminent end of the age.
Their name's origin is disputed. Proposed derivations include the Aramaic hasya (pious), the Greek hosios (holy) and the Hebrew osei hatorah (doers of the Torah). The uncertainty about their name reflects a broader uncertainty about their origins — they appear in the historical record fully formed in the 2nd century BCE, with no clear account of how the movement began. Most scholars connect their emergence to the Maccabean period and the crisis within Judaism that followed the desecration of the Temple by Antiochus IV in 167 BCE.
Josephus describes the Essenes as numbering approximately four thousand across various communities in Judaea — not all at Qumran, which was a relatively small settlement. They were not all celibate (Josephus describes two orders, one celibate and one that married) and not all desert-dwelling. But the Qumran community — which the Dead Sea Scrolls identify as calling itself the Yahad (Community) — appears to have been the most stringent expression of the Essene ideal.
The community at Qumran was destroyed by the Roman army in 68 CE, during the First Jewish-Roman War — two years before the destruction of the Temple in Jerusalem. Before the Romans arrived, the community hid their library — hundreds of scrolls in clay jars — in caves in the nearby cliffs. They were not found again until a Bedouin shepherd accidentally discovered Cave 1 in 1947.