Edward, King of Portugal

Before he ascended the throne, Duarte always followed his father in the affairs of the kingdom. He was knighted in 1415 after the Portuguese capture of the city of Ceuta in North Africa, across from Gibraltar, in the Battle of Ceuta. He became king in 1433, when his father died of the plague.[2]

As king, Duarte soon showed interest in building internal political consensus. During his short reign of five years, he called the Portuguese Cortes (the national assembly) no less than five times to discuss the political affairs of his kingdom. He also followed the politics of his father concerning the maritime exploration of Africa. He encouraged and financed his famous brother, Henry the Navigator, who initiated many expeditions on the west coast of Africa. An expedition of Gil Eanes in 1434 first rounded Cape Bojador on the northwestern coast of Africa, leading the way for further exploration southward along the African coast.

Staute of King Edward in Viseu, by Álvaro de Brée, 1955

The colony at Ceuta rapidly became a drain on the Portuguese treasury, and it was realised that without the city of Tangier, possession of Ceuta was worthless. After Ceuta was captured by the Portuguese, the camel caravans that were part of the overland trade routes began to use Tangier as their new destination. This deprived Ceuta of the materials and goods that made it an attractive market and a vibrant trading locale, and it became an isolated community.

In 1437, Duarte's brothers Henry and Ferdinand persuaded him to launch an attack on the Marinid sultanate of Morocco. The expedition was not unanimously supported and was undertaken against the advice of the Pope.[2] Infante Peter, Duke of Coimbra, and the Infante John were both against the initiative; they preferred to avoid conflict with the Marinid Sultan. Their instincts proved to be justified. The resulting Battle of Tangier, led by Henry, was a debacle. Failing to take the city in a series of assaults, the Portuguese siege camp was soon itself surrounded and starved into submission by a Moroccan relief army. In the resulting treaty, Henry promised to deliver Ceuta back to the Marinids in return for allowing the Portuguese army to depart unmolested. Duarte's youngest brother, Ferdinand, was handed over to the Marinids as a hostage for the final handover of the city.

The debacle at Tangier dominated Duarte's final year. Peter and John urged him to fulfill the treaty, yield Ceuta and secure Ferdinand's release, whereas Henry (who had signed the treaty) urged him to renege on it. Caught in indecision, Duarte assembled the Portuguese Cortes at Leiria in early 1438 for consultation. The Cortes refused to ratify the treaty, preferring to hang on to Ceuta and requesting that Duarte find some other means of obtaining Ferdinand's release.

A Portrait of Edward.

Duarte died late that summer, in Tomar, of the plague, like his father and mother (and her mother) before him. Popular lore suggested he died of heartbreak over the fate of his hapless brother; Ferdinand would remain in captivity in Fez until his own death in 1443.[2]

Duarte's premature death provoked a political crisis in Portugal. Leaving only a young son, Afonso, to inherit the throne, it was generally assumed that Duarte's brothers would take over the regency of the realm. But Duarte's will appointed his unpopular foreign wife, Eleanor of Aragon, as regent. A popular uprising followed, in which the burghers of the realm, assembled by John of Reguengos, acclaimed Peter of Coimbra as regent. But the nobles backed Eleanor's claim, and threatened civil war. The regency crisis was defused by a complicated and tense power-sharing arrangement between Eleanor and Peter.

Another less political side of Duarte's personality is related to culture. A reflective and scholarly infante, he wrote the treatises O Leal Conselheiro (The Loyal Counsellor) and Livro Da Ensinança De Bem Cavalgar Toda Sela ("Book of Teachings on Riding Well on Every Saddle") as well as several poems. He was in the process of revising the Portuguese law code when he died.

Duarte married Eleanor of Aragon, a daughter of Ferdinand I of Aragon and Eleanor of Alburquerque, in 1428.[3]

• Collins, Hugh E. L. (2000). The Order of the Garter, 1348-1461: Chivalry and Politics in Late Medieval England. Clarendon Press.
• Watanabe, Morimichi (1988). Christianson, Gerald; Izbicki, Thomas M. (eds.). Nicholas of Cusa – A Companion to his Life and his Times. Ashgate Publishing Limited.