Álvaro de Luna

Álvaro de Luna y Fernández de Jarava (between 1388 and 13902 June 1453), was a Castilian statesman, favourite of John II of Castile. He served as Constable of Castile and as Grand Master of the Order of Santiago. He earned great influence in the Crown's affairs in the wake of his support to John II against the so-called Infantes of Aragon. Once he lost the protection of the monarch, he was executed in Valladolid in 1453. Provided by Wikipedia