Home âº Research Methods âº Correlation. Correlation means association-more precisely it is a measure of the extent to which two variables are related. If an increase in one variable tends to be associated with an increase in the other then this is known as a positive correlation.
A.D. 468. Photo credit: Fourat/Panoramio. Just like the army, the Roman navy has had its fair share of military disasters. In this one, a joint naval expedition (reputedly one the biggest in ancient times) by the Empire and the independent province of Illiricum against the Vandal Kingdom ended in a huge lopsided defeat.his battle marked the first time that a Roman emperor died at the hands of a foreign enemy. Set in the modern-day city of Razgrad, Bulgaria, the battle pitted the Romansâled by the co-emperors Decius and his son Herenniusâagainst the Goths.
Invasions by Barbarian tribes. The most straightforward theory for Western Romeâs collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s âbarbarianâ groups like the Goths had encroached beyond the Empireâs borders. The Romans weathered a Germanic uprising in the late fourth century, but in 410 the Visigoth King Alaric successfully sacked the city of Rome.