Literally from vulnerability,
In the years of glory, the Roman Empire protected its capital by stopping invaders in Northern or SOuthern Italy before they got to Rome. Rome is also pretty far from the sea, which was well guarded too so it wasnt easy.
In 370AD though, Constantine moved the capital of the Roman empire from Rome to Constantinople (Istanbul). With the capital went the emperor, the legionares, the senate, and all of the body guards and protective solders who went with them.
Years after, the city was weak and vulnerable, most of the residents still lived in Rome and many merchants as well, like gold, silk, ivory, and spice merchants. Barabarian hords from the Germanic States to the north saw this as a golden opprotunity, the broke into the city and ransacked it. Romans got together and offered them a bribe to leave the town and they did, but the roman army had failed and the western provinces had fallen.
Aleric
Well there are two sections of the Roman Empire, the Western and the Eastern (which didn't end until 1527), but I'm going to assume you mean the Western. Rome was sacked multiple times throughout history, but the three most prominent times are by Visigoths in 410 AD, and the Vandals in 455 AD, and the Ostrogoths.
they captured rome in 410 A.D
In the 5th century C.E., Rome was sacked twice by "barbarian" forces. In 410, Alaric led a force of Goths (or, Visigoths) into Italy, sacking Rome and other cities. Later, in the 480s and 490s, a force of Germanic peoples known as Ostrogoth's invaded Italy, captured Rome, and set themselves up as the rulers of the conquered territory, thus bringing the Western Roman Empire to its formal end.
Rome was sacked eight times: four times in antiquity and four times during the Middle Ages. It was sacked by the Gauls in 390 BC, by Alaric, king of the Visigoths, in 410 AD, by Ginseric, king of the vandals, in 455 AD and by Totila, the king of the Ostrogoths in 546 AD. In the Middle Ages the Vatican was sacked and the environs of Rome, including the Vatican, but the city of Rome itself was saved by her walls; The Normans sacked Rome in 1084. Finally Rome was sacked by the troops of Charles V, Holy Roman Emperor, during a mutiny in 1527. Alaric I besieged Rome and some slaves opened the gates. He plundered Rome for three days. Many great buildings were ransacked and many captives were taken. Tens of thousands of Romans let the ruined city and went to the countryside. However, the city then recovered. Ginseric promised Pope Leo I that he would not destroy the city or murder its citizens. The gates of the city were opened. It is accepted that Genseric looted great amounts of treasure from the city, and destroyed cultural objects (the term vandalism comes from this). There is some debate over the severity of the sack. Rome was plundered for 14 days. It is said that Ginseric did not burn buildings and that there was little murder and violence, and the Vandals did not burn the buildings of the city. However, a writer recorded that shiploads of prisoners to be sold as slaves arrived in Africa (where the vandals lived) from Rome. Therefore, the full extent of the sack is unclear. Some historians see this sack as 'the end of the Roman Empire', but this is an overstretched claim. Totila plundered the city, but did not destroy the fortification, even though he usually did so when he took a city. He withdrew and the walls and fortifications were retired quickly. He then marched on Rome again, but was defeated by a Roman general. The general was recalled from Italy and Totila advanced against Rome again and was let in through the treachery of its starving defenders and did not sack the city.
Aleric
They sacked Rome in 410 AD. The Romans didn't treat them very well and kept them from building and from food. They were upset...
Alaric successfully besieged Rome and the Visigoths sacked the city.
Ancient Rome was sacked four times (by the Senone Gauls in 387 BC, the Visigoths in 410 AD, the Vandals in 455 Ad and the Ostrogoths in 546 AD). Some of the times Rome was besieged, she was also sacked. When sieges of Rome were abandoned, this was due to the protection given by the city walls and good organisation of the defence of the city by its citizens or the arrival of Roman armies from elsewhere.
The city of Rome was first conquered by foreign invaders in 410 AD, when the Visigoths, led by King Alaric, sacked the city. It was then again conquered in 455 AD by the Vandals, led by King Gaiseric.
In 410 King Alaric I of the Visigoths besieged Rome for the third time. This time he also sacked it.
The Romans stopped making payments to the Goths, so it made the Goths furious. Then the Goths sacked, or destroyed, Rome in 410 AD.
He sacked Rome, which was practically defunct by then.
Well there are two sections of the Roman Empire, the Western and the Eastern (which didn't end until 1527), but I'm going to assume you mean the Western. Rome was sacked multiple times throughout history, but the three most prominent times are by Visigoths in 410 AD, and the Vandals in 455 AD, and the Ostrogoths.
In AD 410 the Visigoths, under Alaric I, became the first Germanic tribe to conquer the city of Rome itself.
If by Rome you mean the city of Rome, it was sacked by the Gauls in 390 BC, the Visigoths in 410 AD, the Vandals in 455 AD, the Ostrogoth in 546, the Normans in 1084, and the troops of the Holy Roman emperor in 1527. The Arabs also sacked the Vatican (but not Rome) in 846. If by Rome you mean the Roman empire, the western part of the empire was invaded by various Germanic peoples: the Vandals, Sueves, Alans, Burgundians, Alemanni, Angles, Saxons, Jutes, and Frisians.
Alaric, I hope this helps