Was not very stable since the people of high power raised the taxes
politic :Some barbarians settled in the army

The Visigoths looted, burned, and pillaged their way through the city, leaving a wake of destruction wherever they went. The plundering continued for three days. For the first time in nearly a millennium, the city of Rome was in the hands of someone other than the Romans. This was the first time that the city of Rome was sacked, but by no means the last .

By approving Christianity, the Roman state directly undermined its religious traditions. Finally, by this time, Romans considered their emperor a god. But the Christian belief in one god — who was not the emperor — weakened the authority and credibility of the emperor.

Constantine enacted another change that helped accelerate the fall of the Roman Empire. In 330 C.E., he split the empire into two parts: the western half centered in Rome and the eastern half centered in Constantinople, a city he named after himself.

Constantine I was a Roman emperor who ruled early in the 4th century. He was the first Christian emperor and saw the empire begin to become a Christian state. Show All GroupsQUOTES“How pleasing to the wise and intelligent portion of mankind is the concord which exists among you.”—Constantine I
Constantine I was born circa 280 in Naissus, Moesia (now Niš, Serbia). His father became the Western Roman emperor in 305; after his father's death, Constantine fought to take power. He became the Western emperor in 312 and the sole Roman emperor in 324. Constantine was also the first emperor to adhere to Christianity. He issued an edict that protected Christians in the empire and converted to Christianity on his deathbed in 337.

Early LifeFlavius Valerius Constantinus, who would become Roman emperor Constantine I, was born on February 27, circa 280 (sources range from 272 to 284), in Naissus, Moesia (now Niš, Serbia). His father, Flavius Valerius Constantius, was an officer in the Roman army. Constantine's mother, Helena, was from humble beginnings; it is unknown whether she was the wife or concubine of Constantius.In 289, Constantine's father left Helena to marry the stepdaughter of Maximian, the Western Roman emperor. Constantine's father was elevated to deputy emperor under Maximian in 293. Constantine himself was sent to the court of Diocletian, the Eastern Roman emperor. There, Constantine was educated in Latin and Greek. He likely also witnessed the persecution of Christians

Some scholars also believe that Constantine established a new city in order to provide a place for the young religion of Christianity to grow in an environment purer than that of corrupt Rome.The western Empire spoke Latin and was Roman Catholic. The eastern Empire spoke Greek and worshipped under the Eastern Orthodox branch of the Christian church. Over time, the east thrived, while the west declined. In fact, after the western part of the Roman Empire fell, the eastern half continued to exist as the Byzantine Empire for hundreds of years. Therefore, the "fall of Rome" really refers only to the fall of the western half of the Empire.

Other fundamental problems contributed to the fall. In the economically ailing west, a decrease in agricultural production led to higher food prices. The western half of the empire had a large trade deficit with the eastern half. The west purchased luxury goods from the east but had nothing to offer in exchange. To make up for the lack of money, the government began producing more coins with less silver content. This led to inflation. Finally, piracy and attacks from Germanic tribes disrupted the flow of trade, especially in the west.

There were political and military difficulties, as well. It didn't help matters that political amateurs were in control of Rome in the years leading up to its fall. Army generals dominated the emperorship, and corruption was rampant. Over time, the military was transformed into a mercenary army with no real loyalty to Rome. As money grew tight, the government hired the cheaper and less reliable Germanic soldiers to fight in Roman armies. By the end, these armies were defending Rome against their fellow Germanic tribesmen. Under these circumstances, the sack of Rome came as no surprise.

What were the Objectives of the Crusades?
The Objectives of  the crusades was at first to release the Holy Land, in particular Jerusalem, from the Saracens, but in time was extended to seizing Spain from the Moors, the Slavs and Pagans from eastern Europe, and the islands of the Mediterranean.

How many Crusades were there?
There were a total of nine crusades! The first four crusades were seen as the most import and scant reference is made to the other crusades - with the exception of the Children's crusade which effectively led to the decline of the crusade. For a period of two hundred years Europe and Asia were engaged in almost constant warfare. Throughout this period there was a continuous movement of crusaders to and from the Moslem possessions in Asia Minor, Syria, and Egypt.

The Fall of Jerusalem and Acre - the Last Crusades
The kingdom of Jerusalem was gradually lost until the last Christian city, Acre, fell in 1291. The dream of returning to the Holy Land nonetheless proved popular; the Kings of France and England frequently made such plans, though in nearly every case the crusades were redirected or derailed by regional tensions.

The Crusades and the Orders of Religious Knights
The crusades also gave rise to the important knightly orders, the Knights Templar, the Teutonic Knights and the Hospitallers. These were orders of religious knights, working from monastic rule to defend the holy land and pilgrims en route to Jerusalem.

The Crusades The Kingdom of Jerusalem
The Kingdom of Jerusalem was ruled by European Kings and Queens between 1099 and 1291. This section details the founding of the Kingdom of Jerusalem by by Godfrey of Bouillon, the first ruler of the Kingdom of Jerusalem and its fall into the hands of Saladin. The names of all the Kings and Queens of the Kingdom of Jerusalem are also listed on this section.

The Crusades Timeline
Interesting Facts and information about Crusades Timeline in the Middle Ages. People and events in the Middle Ages via the Crusades Timeline. The Crusades Timeline details the key dates and leaders of all the crusades.

Holly Land Pilgrimage 
The Holy Land Pilgrimages sprang from the pilgrimages which Christians had long been accustomed to make to the scenes of Christ's life on earth.