Final answer:
Vespasian's son who took command in Judea was Titus, who also succeeded his father as emperor and led compassionate efforts during disasters, including the eruption of Mount Vesuvius.
Step-by-step explanation:
The student has asked which son of Vespasian took command in Judea. The answer is Titus, Vespasian's older son. He distinguished himself in military campaigns and was responsible for the conquest of Judaea together with his father Vespasian. Upon Vespasian's death, Titus succeeded his father as emperor. Titus is well-known for his efforts in aiding the victims of the eruption of Mount Vesuvius, which destroyed Pompeii. His rule followed Vespasian's, from 79-81 CE, before his untimely death.
During Vespasian's rule, significant construction projects such as the building of the Colosseum were undertaken. These public works were funded in part by the spoils from the conquest of Judea. Vespasian had planned for succession, grooming Titus to follow him, and despite his short reign, Titus' leadership showed both competence and compassion.