Conversation so far:
What happened in the 3rd century regarding Migration Period Art?
In the 3rd century, the Roman Empire almost collapsed and its army was becoming increasingly Germanic in make-up.
What happened in the 4th century to Germanic tribes?
In the 4th century when Huns pushed German tribes westward, they spilled across the Empire's borders and began to settle there.
What did Huns pushing German tribes do to the army in the 4th century?
The Visigoths settled in Italy and then Spain, in the north the Franks settled into Gaul and western Germany.
What happened to the rest in the 5th century?
Iin the 5th century the Angles, Saxons and Jutes invaded Britain.
What was the rest ruled by besides Angles, Saxons, and Jutes?
By the close of the 6th century the Western Roman Empire was almost completely replaced with smaller less politically organized, but vigorous, Germanic kingdoms.
What did being ruled by Germanic kingdoms for the Western Roman Empire do?
Although these kingdoms were never homogeneous, they shared certain common cultural features.

Question: When did this become a diffrence
Self-contained rewrite: When did the Western Roman Empire changing to being ruled by Germanic kings become a diffrence?