2nd Roman prefect to govern all Palestine. Exactly when & why Claudius sent Tiberius Julius Alexander to replace Fadus is uncertain.  He was a wealthy Romanized apostate Jew from Alexandria who was a nephew of the philosopher Philo. Still he did not hesitate to use Roman military torture to suppress Jewish dissidents. He ordered two sons of Judah of Gamala to be crucified (charges uncertain). His effectiveness in maintaining social order led to his appointment as prefect of Egypt during the Jewish War.

References: Josephus, Antiquities 18.259; 19.276; 20.100-103; 
                   _____, War 2.220-223, 309, 492-497, 616-618, 5:205, 510, 6:237-242; 
                   Tacitus, Annals 15.28; Histories 1.11; 2.74-79.
                   Suetonius, Twelve Caesars: Vespasian 6.3.

Other resources on line:

• Julius Alexander Junior - Jona  Lendering's biography [Livius: Articles in Ancient History].

• Tiberius Julius Alexander - well-documented article in Wikipedia's web.