After a 1580 succession crisis, this country was unified with an eastern neighbor due to the decline of the House of Aviz.
During the Napoleonic Wars, this country besieged and occupied the territory of French Guiana. Jean-Andoche Junot invaded this country, then negotiated a retreat from it in the Convention of Sintra. The oldest continuously active treaty in the world is a treaty of friendship signed by this country and the Kingdom of (*) England. An attempted regicide in this country was dealt with by the execution of the entire TÃ¡vora family. After a 1580 succession crisis, this country was unified with an eastern neighbor due to the decline of the House of Aviz. This country's capital city was completely destroyed by a tsunami and earthquake in 1755. For 10 points, name this Iberian country whose royals included Prince Henry the Navigator.
During the Napoleonic Wars, this country besieged and occupied the territory of French Guiana.
Portugal