Juan Alonso de Guzmán, 1st Count of Niebla

Don Juan Alonso de Guzmán y Cabrera, 1st Count of Niebla or Juan Alonso Pérez de Guzmán y Osorio (20 December 1342 – 5 October 1396) (Sp.:Juan Alonso de Guzmán y Cabrera, conde de Niebla) was the first Count of Niebla.

Biography He was the second son of Juan Alonso Pérez de Guzmán y Coronel and his second wife Urraca Osorio. Guzmán el Bueno was his grandfather. In 1365, Juan Alfonso de Guzmán inherited the Lordship of Sanlúcar, located in Andalusia, following the death of his older brother, Alonso Pérez.

Count of Niebla The Counts of Niebla, was created not later than on 8 June 1369 at the occasion of the second marriage of Juan Alonso de Guzman y to Beatriz de Castilla y Ponce de Leon, an illegitimate daughter of Henry II of Castile. He received this title as reward for the significant services he had rendered in securing the King's accession to the throne.

Marriage and children Juan Alonso de Guzman y Osorio (1342–1396) was married twice. First in 1369 to Juana Enriquez, granddaughter of Enrique Enríquez the Younger. She died without issue. Secondly around 1374 to Beatriz de Castilla y Ponce de Leon (d. 1409), an illegitimate daughter of Henry II of Castile. They had 3 sons : Enrique Pérez de Guzmán, 2nd Count of Niebla and 5th Lord of Sanlúcar (1375-1436). Had issue. Alfonso Pérez de Guzmán y Castilla, 5th Lord of Ayamonte, Lepe and La Redondela. Juan Alonso Pérez de Guzmán, the Posthumous (d. 1436). He was born in 1396 after his father had died.

The count also had three illegitimate children : Pedro Núñez, Mayor and Leonor.