Diego Felipez de Guzmán, 1st Marquis of Leganés

Diego Mexía Felipez de Guzmán y Dávila (1580–1655), Viscount of Butarque and first Marquis of Leganés, was a Spanish politician and army commander.

He was the youngest son of Diego Velázquez Dávila y Bracamonte, marquis of Loriana, and Leonor de Gúzman, aunt of the Count-Duke of Olivares.

Since 1600, he fought during more than 20 years in the Spanish Netherlands in the service of Albert VII, Archduke of Austria. After his death, Diego returned to Spain where his cousin Olivares had become valido, and under his patronage, Diego soon became very influential. He became a member of the State Council in 1626, was made Marquis of Leganés in 1627 and married in the same year with Polixena Spinola, the very rich daughter of the great general Ambrosio Spinola.

In 1627 he was sent back to Flanders to force the States General to accept Olivares' project of the Unión de Armas, and pay for an extra 12.000 infantry soldiers.
On his way back, he and general Ambrosio Spinola visited the Siege of La Rochelle by the French, on which occasion they discussed the succession of the Duchy of Mantua, which would eventually lead to the War of the Mantuan Succession.

After this mission, he held several important political and military posts in the Spanish Netherlands, which earned him the title of Grandee of Spain in 1634.

On September 24, 1635 he was named Captain General and Governor of the Duchy of Milan, and was soon involved in the Franco-Spanish War (1635) and the Piedmontese Civil War against France, Parma, Mantua and Savoy. He defeated Odoardo Farnese, Duke of Parma and Piacenza and forced him to sign a peace treaty in 1637. He also prevented the French to take the Valtellina and won some victories against Savoy.

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