House of Aviz

House of Aviz Casa de Avis
Arms of the House of Aviz
Parent house	Portuguese House of Burgundy
Country	Kingdom of Portugal
Founded	1385
Founder	John I
Final ruler	Henry I or António I (disputed)
Titles	King of Portugal King of Aragon King of the Algarve Prince of Antioch Prince of Portugal Duke of Viseu Duke of Beja Duke of Coimbra Duke of Guarda Duke of Guimarães Lord of Ceuta Lord of Alcácer Lord of Guinea
Dissolution	1580 or 1583 (disputed)
Cadet branches	House of Coimbra House of Lancaster House of Braganza House of Brazil House of Brazil-Saxe-Coburg-Gota House of Orleans-Brazil House of Cadaval House of Lavradio House of Abrantes

The House of Aviz (Portuguese: Casa de Avis [ɐˈviʃ]), also known as the Joanine Dynasty (Dinastia Joanina), was a dynasty of Portuguese origin which flourished during the Renaissance and the period of the Portuguese discoveries, when Portugal expanded its power globally.

The house was founded by King John I of Portugal, Grand-Master of the Order of Aviz and illegitimate son of King Pedro I (of the Portuguese House of Burgundy), who ascended to the throne after successfully pressing his claim during the 1383–1385 Portuguese interregnum.^[1] Aviz monarchs would rule Portugal through the Age of Discovery, establishing Portugal as a global power following the creation of the Portuguese Empire. In 1494, Pope Alexander VI divided the world under the dominion of Portugal and Spain with the Treaty of Tordesillas.

The House of Aviz has produced numerous prominent figures in both European and global history, including Prince Henry the Navigator, King Manuel I of Portugal, and Holy Roman Empress Isabella of Portugal. Numerous Aviz dynasts have also claimed thrones or titles across Europe, including King Peter V of Aragon and John, Prince of Antioch. The Aviz ruled Portugal from 1385 until 1580, when the Philippine Dynasty succeeded to the throne following the Portuguese succession crisis of 1580.