How long was the Iberian Union in place before John IV's reign?
40 years
60 years
80 years
100 years
Answer
The Iberian Union, a period of Spanish rule over Portugal, lasted 60 years before the reign of John IV. This union resulted from a dynastic crisis in Portugal, leading to the Spanish Habsburg Philip II claiming the Portuguese throne in 1580.
The Royal Journey: Unraveling the Legacy of John IV of Portugal