WI: Thyrrhenian Union

What if, in the Early Middle Ages, the cities of Almafi, Lucca and Pisa, plus the islands of Corsica and Malta, would form a "Thyrrhenian Union"?

- How could this happen?
- More importantly, what consequences would it have?
 
Well, in the very unlikely event such a union would form, it would eventually be crushed by greater powers. if its earlier than Barbarossa the HRE is not gonna be happy....
 
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