Tello Alfonso of Castile (1337 – October 1370) was the seventh of the ten illegitimate children of Alfonso XI of Castile and Eleanor of Guzman. He was a prince of Castile and First Lord of Aguilar de Campoo. In Spanish he is known as Tello de Castilla, Infante de Castilla; Señor de Aguilar de Campoo, de Vizcaya, de Castañeda y de Lara.

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Quick Facts Born, Died ...

Tello Alfonso
Lord of Aguilar de Campoo
Sarcophagus of Tello of Castille in the convent of Saint Francis in Palencia
Born	1337
Died	October 1370 (aged 33)
Noble family	Castilian House of Ivrea
Spouse(s)	Juana of Lara
Issue	See Issue
Father	Alfonso XI of Castile
Mother	Eleanor of Guzman

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He was born in Seville. He participated along with his brothers in the struggles against the despotic rule of his half-brother Pedro of Castile also known as Pedro the Cruel.^{[citation needed]}

In 1353 he married Juana of Lara (daughter of Juan Núñez III de Lara), but she was reportedly murdered in 1359, on orders of King Peter (Pedro the Cruel). Tello and Juana had no legitimate children. It is reported that Tello kept the news of her death secret in order to maintain possession of her dowry.^{[citation needed]}

Tello had many illegitimate children:^{[citation needed]}

• Juan Tellez de Castilla, Señor de Aguilar de Campoo (1355-1385). He died at the Battle of Aljubarrota. From his marriage to Leonor Lasso de la Vega arose the Marquesses of Aguilar de Campoo (Grandees of Spain).^[1]
• Alfonso Tellez de Castilla, b. 1365
• Pedro Enríquez de Castilla, Señor de Camporredondo, b. 1370
• Fernando Tellez de Castilla
• Constanza Tellez de Castilla
• Leonor Tellez de Castilla
• Isabel Tellez de Castilla
• Juana Tellez de Castilla
• María Tellez de Castilla