Vespasian was a general under Claudius and Nero. He fought as a commander in the First Jewish-Roman War along with his son Titus. Following the turmoil of the Year of the Four Emperors, in 69 AD, four emperors were enthroned: Galba, Otho, Vitellius, and, lastly, Vespasian, who crushed Vitellius' forces and became emperor. He reconstructed many buildings which were uncompleted, like a statue of Apollo and the temple of "Divus Claudius" ("the deified Claudius"), both initiated by Nero. Buildings once destroyed by the Great Fire of Rome were rebuilt, and he revitalized the Capitol. Vespasian also started the construction of the Flavian Amphitheater, more commonly known as the Colosseum. The historians Josephus and Pliny the Elder wrote their works during Vespasian's reign. Vespasian was Josephus' sponsor and Pliny dedicated his "Naturalis Historia" to Titus, son of Vespasian. Vespasian sent legions to defend the eastern frontier in Cappadocia, extended the occupation in Britannia (modern-day England, Wales and southern Scotland) and reformed the tax system. He died in 79 AD.