In Antiquities of the Jews Book 18 (Chapter 1) Josephus states that Judas, along with Zadok the Pharisee, founded the Zealots, which he calls the "fourth sect" of first century Judaism (the first three are the Sadducees, the Pharisees, and the Essenes). Josephus blames the Zealots, a group of theocratical-nationalists who preached that God alone was the ruler of Israel and later urged that no taxes should be paid to Rome, for the Great Jewish Revolt and for the destruction of Herod's Temple.
Josephus does not relate the death of Judas, although he does report (Antiquities 20.5.2 102) that Judas' sons James and Simon were executed by procurator Tiberius Julius Alexander in about 46 AD, several years after Rabbi Gamaliel's statement. He also reports that Menahem, one of the early leaders of the Jewish Revolt in AD 66, was Judas´son, but most scholars doubt this. Menahem may have been Judas´ grandson, however. Menahem's cousin, Eleazar ben Ya´ir, then escaped to the fortress of Masada where he became a leader of the last defenders against the Roman Empire.