The "man of sin," who overtook the Jewish Temple just a decade or so after St. Paul wrote 2 Thess 2, was the Zealot terrorist Messiah---in particular Menahem, who in AD 66 overtook the Roman Fortress of Masada, used the weapons to launch the Revolt against Rome from the Holy Temple in Jerusalem, and executed the Jewish High Priest Ananias. Menahem was the grandson of Judas the Galilean, who had led an anti-Roman revolt in 6 CE; two of his relatives had been crucified after a similar disturbance. The group of Menahem was called Sicarians ('dagger men'). The Sicarii Zealots hailed their leader as king of the Jews and went to Jerusalem, where they laid siege to the remaining Roman garrison. In September AD 66, the Roman leaders occupying Jerusalem surrendered and were lynched. Here's a great biography on the false Jewish messiah, Menahem,
This event which launched the Great Revolt was the event St. Paul had prophesied in 2 Thess 2, which the Thessalonians were to mark as the correct time for Christ's judgment to begin upon Israel. And indeed it was the beginning of God's Judgment, for immediately following this event the Romans, led by Cestius Gallus, marched to the rebellious province, liberated the pro-Roman capital of Galilee (Sepphoris), and continued to Jerusalem. When they appeared at Jerusalem, Luke 21:20-22 took place, and the Jewish Christians fled the city and were saved. Cestius Gallus was temporarily halted at Jerusalem by the Zealot revolutionaries, and this temporary halt allowed the Christians to escape the great city as Jesus had told them to do. But the Romans quickly returned with a larger army and sealed off the entire city, leaving millions of Jews from all over the empire stuck inside (Luke 19:40-44), where they went through civil war, plague, famine, and then a slaughter by the Romans at AD 70. The Temple was taken down stone by stone as Christ had said. "For those were the days of vengeance, that all things written might be fulfilled." (Luke 21:20-22)
This event which launched the Great Revolt was the event St. Paul had prophesied in 2 Thess 2, which the Thessalonians were to mark as the correct time for Christ's judgment to begin upon Israel. And indeed it was the beginning of God's Judgment, for immediately following this event the Romans, led by Cestius Gallus, marched to the rebellious province, liberated the pro-Roman capital of Galilee (Sepphoris), and continued to Jerusalem. When they appeared at Jerusalem, Luke 21:20-22 took place, and the Jewish Christians fled the city and were saved. Cestius Gallus was temporarily halted at Jerusalem by the Zealot revolutionaries, and this temporary halt allowed the Christians to escape the great city as Jesus had told them to do. But the Romans quickly returned with a larger army and sealed off the entire city, leaving millions of Jews from all over the empire stuck inside (Luke 19:40-44), where they went through civil war, plague, famine, and then a slaughter by the Romans at AD 70. The Temple was taken down stone by stone as Christ had said. "For those were the days of vengeance, that all things written might be fulfilled." (Luke 21:20-22)