Dynastic union

A dynastic union is the combination by which two different states are governed by the same monarch or dynasty, while their boundaries, their laws and their interests remain distinct.

It differs from a personal union in that a personal union is under a monarch, but not under a dynasty.

Union of Kingdom of Aragon and County of Barcelona

Marriage of Count of Barcelona Raymond Berengar IV of Barcelona and future Queen of Aragon Petronila of Aragon on 1137 that formed the Crown of Aragon.

Union of Crown of Castile and Crown of Aragon

Marriage of Isabella of Castile and Ferdinand II of Aragon on 1469 that laid the foundations for the kingdom of Spain. They didn't ascend to their respectives thrones until 1479.

Union of Kingdom of Spain and Kingdom of Portugal

Dynastic union between Spain (the union between the Crowns of Castile and Aragon) and Portugal (1580-1640), generally called the Iberian Union, under the Philippine Dynasty.

References