Dom John IV (19 March 1604 – 6 November 1656), was King of Portugal from 1640 until his death in 1656. The grandson of Catherine, Duchess of Braganza, a claimant to the crown during the Portuguese succession crisis of 1580, he was proclaimed king in 1640 following the outbreak of the Portuguese Restoration War.
This ended the 60-year-old Iberian Union with Spain, and put the House of Braganza on the Portuguese throne. By the time of his death in 1656, the Portuguese Empire had reached its maximum territorial extent.
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