Why did the Roman Empire fall?

1. How many emperors were there in the century they are looking at2. Cause of death - how many were murdered, committed suicide, died

of natural causes or were killed in battle3. Of the Emperors that were murdered who murdered them: family,

Praetorian Guard, Generals, own soldiers or other soldiers4. Look at those emperors that died by suicide or natural causes and

look at 'further details.' Should any of these really be classified as 'murdered'?

5. Were any emperors in their century threatened by plague or revolts 6. External threats: which emperors were threatened by Persia (this

was an empire to the east of the Roman Empire), Dacia (a Roman province north of the River Danube), Alans, Germans, Goths, Huns, Vandals (these were barbarian tribes outside the Roman Empire)