The will of Medina Sidonia: how one of the greatest fortunes in Spain was divided.

The will of the Duke of Medina Sidonia, drafted in 1636, reflects the inheritance of one of the greatest fortunes in Spain and the history of glory and decline of this noble family. Founded in the 15th century by Alonso Pérez de Guzmán, the House of Medina Sidonia became a powerful lineage with extensive holdings in the Iberian Peninsula, particularly in Sanlúcar de Barrameda. Despite its splendor and the strategic alliances that consolidated its wealth, the fortune eventually faced threats from discord and ruin.

December 8, 2025

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The Will of Medina Sidonia: How One of Spain's Greatest Fortunes Was Divided

In the vast panorama of Spanish history, few noble families have reached the magnitude and mystery of the Dukes of Medina Sidonia. Their will, a document that encapsulates the inheritance of one of Spain's greatest fortunes, chronicles the glory and decline of a lineage that once dominated the skies of the Iberian Peninsula. What secrets lie behind this decision? How could such an enormous fortune fall into discord and ruin? Let us delve into the fascinating world of the Medina Sidonia.

The Grandeur of a Noble House

The House of Medina Sidonia, founded in the 15th century, rose to become one of the most powerful lineages of the Spanish nobility. Its origins trace back to Alonso Pérez de Guzmán, who was appointed the first Duke of Medina Sidonia in 1484 by the Catholic Monarchs. This title, which elevated itself after the Reconquista, was a symbol of unparalleled power and wealth. The Guzmán family became lords of vast lands, including the famous coastal town of Sanlúcar de Barrameda, where their influence was nearly absolute.

Throughout the centuries, the Medina Sidonia maintained strategic alliances with other noble houses, such as the Dukes of Béjar and the Dukes of Osuna, allowing them to consolidate their wealth and expand their influence. Documents from the period, such as the archives of the House of Medina Sidonia, reveal records of marriages and agreements that cemented their status. It was in this environment of splendor that a fortune capable of rivaling the treasures of the New World was forged. However, like many noble tales in history, this grandeur was not destined to last forever.

The Will: The Final Move of a Noble

The will of the Duke of Medina Sidonia, drafted in 1636, is a document that marks a turning point in the history of the Spanish nobility...