WI: Valentinian III accepts Honoria's marriage to Attila

According to some historians, Honoria, the sister of Western Roman Emperor, Valentinian III, was going to married off to a Roman Senator. She didn't want to be married off, so apparently, she sent to the one person she thought could help her...

Atilla the Hun. Now, whether or not she sent the ring to actually propose to Atilla is debatably, but Atilla certainly interpreted it to be. So, as a dowry, Atilla only asked for... half the Western Roman Empire. When Emperor Valentinian III discovered this, he almost executed Honoria, only to be convicted by his mother just to exile her, and denied the supposed marriage proposal as legitimate. Outrage, Atilla used this as an excuse to invade the Western Roman Empire (Although, he was already planning it for years beforehand)

Whether if some of this tale is true is debatable, as some things are just unknown. However, for the sake of the question, let's say Valentinian III decided, for some reason, was okay with Honoria marrying the Hunnic King, and also giving up half the Western Roman Emperor, having the foresight to see it wise not to anger Attila.

Now, let's get obvious out the way - This would be both political and quite literal suicide. Romans would be angry at the Western Roman Emperor giving half of what remains of the empire to a barbarian.

But either way, what if Attila did actually marry Honoria, and how would this turn out for Valentinian III and the Western Roman Empire (Probably not good)
 
Valentinian III gets assassinated. Attila invades the rest of the Western Roman Empire as a pre-text of avenging his fallen brother. Coin toss whether he succeeds which means he becomes King of the Huns and the Western Roman Emperor like in Coronation of the Hun or fails like IOTL.
 
Well, Atilla would probably take Spain and Gaul, then take its time integrating them into his own empire and then declare war on Rome to take the rest, BTW, the death or deposition of Valentinian III would be a perfect excuse to do war.
 
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