That depends on which invasion you are referring to:
Between 100 to 500 CE you have several invasions of different parts of the Roman Empire:
Obviously there was not just one ruler for that entire period.
The Mongols never got anywhere near the city of Rome. Nor did they invade the Byzantine Empire (this is the name for the Eastern Roman Empire after the fall of the Western Roman Empire). The Mongol invasions in Europe occurred during the Middle Ages, in the 13th century. The invasions in Europe were in Eastern Europe, particularly Ukraine and Russia. Poland, Hungary, Romania and Croatia were attacked and defeated, but not occupied.
At the first invasion of Britain, under Julius Caesar, there was no emperor as Rome was a republic. Almost a hundred years later the emperor Claudius made his so-called invasion of Britain and officially annexed it into the empire.
No, Odoacer was not an Emperor. He was a general who deposed Romulus Augustulus, the last Emperor of the West Roman Empire, and asked Zeno, the Emperor of the East Roman Empire of the time, to take responsibility for both halves of the empire. Odoacer continued on, apparently as a king or supreme governor, in Italy. Please use the link below for more on Odoacer.
Diocletian was a Roman Emperor who reformed Roman policies to fix the perceived problems of the time. Many of these reforms improved the empire for a time or persisted until the fall of the empire
Nero was the Roman emperor at the time of Boudicca's unpleasantness.
Calvary, Judaea, according to the New Testament Judaea was where Jesus was crucified. The name of the Roman emperor at the time was Tiberius.
At the first invasion of Britain, under Julius Caesar, there was no emperor as Rome was a republic. Almost a hundred years later the emperor Claudius made his so-called invasion of Britain and officially annexed it into the empire.
The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.The Roman empire began after the second Punic war and a that time Rome did not have an emperor, it was the republic and was ruled by elected officials.
Titus was the emperor at the time of the Vesuvius eruption.
trajan, he controlled the most land during his time.
Charlemagne was crown as Roman Emperor, not as Holy Roman Emperor. The title of Holy Roman Emperor emerged centuries later. Charlemagne was given the title of Roman Emperor to symbolise the independence of the papacy from the Byzantine emperor and from Orthodox Christianity, the religion of the Byzantines. The title of this emperor was actually Roman Emperor. Byzantine and Byzantine Empire are terms which have been coined by historians. They use it to indicate the eastern part of the Roman Empire after the fall of the western part of this empire. The term Byzantine was not known at that time. The empire was called Roman Empire and the emperor was called Roman emperor. The coronation of Charlemagne was presented as the creation of another Roman Empire in the west, one which was independent from the one in the east. The Byzantines had retaken Italy after the Visigoths had taken it over. They lost some of their territories to an invasion by the Lombards in northern Italy, but they retained a territory in central Italy, the Exarchate of Ravenna. Rome had been under this exarchate an the emperor had been interfering with affairs in Rome and with papal affairs. The alliance between the pope and Charlemagne gave power to Catholic Christendom and independence to the papacy
The Roman emperor during the time of Jesus would be Octavian, more commonly known by Caesar Augustus. Augustus was also the 1st Roman emperor.
There was a completed Roman withdrawal from Britain in 426 AD. The emperor at the time was Valentinian III.
No, Odoacer was not an Emperor. He was a general who deposed Romulus Augustulus, the last Emperor of the West Roman Empire, and asked Zeno, the Emperor of the East Roman Empire of the time, to take responsibility for both halves of the empire. Odoacer continued on, apparently as a king or supreme governor, in Italy. Please use the link below for more on Odoacer.
Diocletian was a Roman Emperor who reformed Roman policies to fix the perceived problems of the time. Many of these reforms improved the empire for a time or persisted until the fall of the empire
From Augustus' time, the legions were located in the border provinces to protect the empire from foreign invasion.
Pope Leo III crowned Charlemagne Emperor in St. Peter's Basilica, in Rome, on December 25, 800 AD. At the time he crowned Charlemagne, he referred to the empire as the Roman Empire. Today, historians call Charlemagne's empire the Carolingian Empire, but at the time, people in Western Europe called it the Roman Empire, as Pope Leo III had. The people of the Byzantine Empire of the time, who had always called their country the Roman Empire, and would as long as it existed, were not very happy about this. The Carolingian Empire divided into France, and a country we call the Holy Roman Empire, but which called itself the Roman Empire for some time. If all this sounds confusing, imagine how it sounded to the people of the time. There are a links below.
Honorius, who was the Western Roman Emperor from 395 to 423 AD, would have likely spoken Latin as it was the official language of the Roman Empire at that time.