Becoming Closer
The Vandals
In AD 429 the Vandals finished a long march from their home in Europe to the point of Carthage, which they rebuilt.  Carthage was Rome’s ancient enemy (remember Hannibal and his elephants?).  From these people we get our English word Vandalism.
The fascinating thing about this set of campaigns is the complete improbability of it all.  Rome controlled the Mediterranean.  It is an axiom of naval warfare that when one power controls -- and can closely blockade -- the ports of another, the weaker power will have no way to challenge that naval supremacy.  The stronger power simply destroys the ships as they are being constructed.  If you had to predict the route of the next invasion, this would not be it.
Genseric, the leader of the Vandals, conducted a sea campaign, taking most of the islands of the middle Mediterranean in a series of ferocious battles.  Sea battles at that time usually resulted in the loser drowning -- total destruction of a fleet was common.  The stated amount of bloodshed, and certainly the destruction of merchant shipping, are consistent with the campaigns of piracy the Vandals carried out.
Genseric sacked Rome in AD 455.  Interestingly, Pope Leo (who did not know he was a Pope;  he thought of himself only as Bishop of Rome) went out and begged for the lives of the citizens.  This request was granted (rape and pillage were conducted on a business as usual basis).  Thus we see a second connection to the church -- and evidence of the “sealing”.
Genseric died a few  months later (it seems that sacking Rome is not good for your health).  The Vandals’ power waned, and another nation came on the scene.