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The Mahdia campaign of 1087 was an attack on the North African town of Mahdia by armed ships from Genoa and Pisa in northern Italy. It had been prompted by the actions of its ruler Tamim (rule 1062–1108) as a pirate in waters off the Italian peninsula, along with his involvement in Sicily fighting the Norman invasion. The attack was led by Hugh of Pisa, with military aid from Rome; the nobleman Pantaleone from Amalfi was also involved, and the whole endeavour had the backing of Matilda of Tuscany. It succeeded in capturing the city, but they could not hold it; the money from the plunder was spent on the cathedral at Pisa and to build a new church.

Crusade historian Carl Erdmann considers the raid a direct precursor to the First Crusade which occurred eight years later, as it was conducted under the banner of St. Peter against a Muslim ruler who was demonised in the accounts of it, and a form of indulgence was granted to the campaigners by Pope Victor III.

References

• Erdmann, Carl. The Origin of the Idea of Crusade, tr. Marshall W. Baldwin and Walter Goffart. Princeton University Press, 1977.
• Cowdrey, H. E. J. "The Mahdia Campaign of 1087." The English Historical Review, 92:362 (January, 1977), 1–29.