Final answer:
Tiberius Caesar was the Roman emperor during the crucifixion, resurrection, and ascension of Jesus of Nazareth.
Step-by-step explanation:
The emperor who was in power during the time of Jesus' crucifixion, resurrection, and ascension was Tiberius Caesar. Jesus of Nazareth's ministry and subsequent crucifixion occurred in the first century, around 33 CE, a period when the Roman Empire was under the rule of Tiberius.
He was known for his reclusive leadership and left much of the day-to-day governance to his subordinates, like Pontius Pilate, who served as the prefect of the province of Judea during Jesus' crucifixion. The persecution of Christians that followed was part of the Roman response to what they saw as a challenge to their authority and the state religion.