The Mahdia campaign of 1087 was an attack Attack on the North African town of Mahdia by armed ships from the northern Italian maritime republics of Genoa and Pisa .

The attack Attack was led by Hugh of Pisa , with military aid Assistance from Rome and the Genoese navy ; the nobleman Pantaleone from Amalfi was also involved Participation , and the whole endeavour had the backing of Matilda of Tuscany .

It succeeded in capturing the city , but they could not hold Defending it ; the money from the plunder was spent Expend_resource on the cathedral at Pisa and to build Building a new church .