Juan Núñez II de Lara (c. 1276 – 1315), nicknamed el Mozo or el de la Barba (the bearded one), was a Spanish noble, and head of the House of Lara in the service of the Kingdom of Castile.
In the chronicles of the king, Sancho IV of Castile, one anecdote is dedicated to this Juan Nunez where the monarch entrusts Juan with the care of his son, infante Ferdinand.
Don Juan Nuñez, bien sabedes commo llegastes hasta mi mozo sin barbas, é fice vos mucha merced, lo uno en casamiento que vos dí muy bueno, é lo otro en cuantía, e ruego vos que pues yo so tan mal andante commo vos vedes, que si yo muriere, que nunca vos desamparedes al infante don Fernando, mi fijo, fasta que el hay a barbas é otrosí, que sirvades a la reina en toda su vida ça mucho vos lo meresció á vos é á vuestro linaje.
According to Carlos Estepa Díez, this text reveals that between infancy and coming of age, it can be deduced that Juan Nunez II was brought for the first time before King Sancho IV (c. 1288), when he would have been around 12 to 14 years of age.
Throughout his life, Juan Nunez fought against and allied himself with both Diego López V de Haro and John of Castile in a strategic power struggle for land and influence over king Ferdinand IV. This lifelong fight culminated in the loss of most of Juan Nunez' lands and territories at the hands of the king when he surrendered to royal forces after a protracted siege of his town at Tordehumos.
Lara managed to eventually regain his status and some of his titles after his participation and distinction in Ferdinand IV's invasion of Granada. While the expedition eventually ended in failure, Lara had several exploits, including the taking of the town of Gibraltar from Moorish forces. He also participated in the disastrous Siege of Algeciras of 1309 and retreated with the army in 1310. Lara was one of the few followers of the king who did not desert his service during the war.
According to the chronicles of the King Alfonso XI of Castile, Juan Nunez II de Lara died in 1315 during the Courts of Burgos.
E fizo su testamento, e por que no avie fijo heredero nin fija que heredase después de su muerte, mandó para su alma a Lara que era suya e quanto en el mundo avia. E los fijos dalgo de Castilla acordaron que la casa honrrada de Lara que no era bien que quedase sin señor, porque antiguamente fue un solar de los tres de Castilla; e con otorgamiento del rrey y de los sus tutores y de todos los otros en general, dieron señor heredero a la casa de Lara, e este fue don Joan Nuñez,sobrino desde don Joan Nuñez de la Barba que fino, hijo de Joana su hermana e de don Fernando que llamavan de la Çerda (...)
Masnata y de Quesada, David E. (1985). La Casa Real de la Cerda, Estudios Genealógicos y Heráldicos. Madrid: Asociación Española de Estudios Genealógicos y Heráldicos. pp. 169–229. ISBN84-398-3591-4.
de Salazar y Acha, Jaime (2000). La casa del Rey de Castilla y León en la Edad Media (1ª ed.). Madrid: Centro de Estudios Políticos y Constitucionales. ISBN84-259-1128-1.