John II's reign, lasting 48 years, was one of the longest in Castilian history, but John himself was not a particularly capable monarch. He spent his time verse-making, hunting, and holding tournaments. His favourite, Álvaro de Luna, heavily influenced him until his second wife, Isabella of Portugal, obtained control of his feeble will. At her instigation, he dismissed and executed his faithful and able servant, an act which is said to have caused him much remorse.
John II, (born March 6, 1405, Toro, Castile—died July 21, 1454, Valladolid), king of Castile from 1406 to 1454; his political weakness led him to rely on his favourite, Álvaro de Luna, whom he made constable. He was nevertheless considered a man of cultivated taste and a patron of poets.
John II, (born 1398, Medina del Campo, Leon—died 1479, Barcelona), king of Aragon (1458–79) and also king of Navarre (1425–79); he was the instigator of the union of Castile and Aragon through the historic marriage of his son Ferdinand with Isabella of Castile.
John II (6 March 1405 – 20 July 1454) was King of Castile from 1406 to 1454. He was the son of Henry III of Castile and his wife Katherine of Lancaster, daughter of John of Gaunt, Duke of Lancaster by Constance of Castile, daughter of King Pedro of Castile (known as 'Pedro the Cruel').
March 6, 1405 – July 21, 1454. John II of Castile was born on March 6, 1405, in Toro, Castile. The first-born son of King Henry III and Queen Catherine, John was the couple’s third child. A year after the prince’s birth, Henry died from illness at the age of 27. Through his efforts, the king left behind a stable kingdom with a prosperous economy to his infant son.
John II of Castile, also known as Juan II de Castilla, born March 6, 1405, in Toro, Spain, was the King of Castile and León from 1406 to 1454. He was known as a patron of poets, most notably Juan de Mena, who belonged to his literary court. Though he is not remembered as a poet himself, certain verses have been historically attributed to him and collected in anthologies of Spanish poetry.
JOHN II. (1405–1454), king of Castile, was born on the 6th of March 1405, the son of Henry III. of Castile and of his wife Catherine, daughter of John of Gaunt. He succeeded his father on the 25th of December 1406 at the age of a year and ten months.
Juan II (March 6, 1405 - July 20, 1454), King of Castile and Leon was the son of Enrique III and of his wife Catherine of Dover, daughter of John of Gaunt by Constance of Castile, daughter of King Pedro I.
John II ( Spanish: Juan II, Catalan: Joan II, Aragonese: Chuan II and Basque: Joanes II; 29 June 1398 – 20 January 1479), called the Great ( el Gran) or the Faithless ( el Sense Fe ),  was King of Aragon from 1458 until his death in 1479. As the husband of Queen Blanche I of Navarre, he was King of Navarre from 1425 to 1479.
John I of Castile, accompanied by allied French cavalry, then entered Portugal again by way of Ciudad Rodrigo and Celorico in July 1385 to conquer Lisbon and remove John I from the Portuguese throne, but the disastrous defeats suffered by his army in Trancoso and at the Battle of Aljubarrota in May and August 1385 had ended any possibility of his reigning as king of Portugal. He fled to Santarém and from there down the Tagus to meet the fleet near Lisbon.