Under the protection of the Norman William II, third Duke of Apulia, in October 1126 the administrators of Amalfi reached a profitable commercial agreement with the neighbouring Pisa, to collaborate in the protection of their common interests in the Tyrrhenian.
So a protección do normando Guillerme, terceiro Duque de Puglia, os administradores de Amalfi acadaron, en outubro de 1126, un proveitoso acordo comercial con Pisa para colaborar na tutela dos intereses comúns no Tirreno.