^The Anales de Pamplona of the Códice de Roda indicate that he was aged 12 at the time he became king. This is usually taken to reflect a birth in 919 and succession on the death of his uncle in 931. However, the Initium regnum Pampilonam, an eleventh-century addition to the same codex, says that at the time of his death in February 970 he had ruled for 35 years, apparently using his mother's 934 displacement as regent for the starting date. If this is the date used by the Anales it would instead place his birth about 922.[1]
Lacarra de Miguel, José María (1945). "Textos navarros del Códice de Roda"(PDF). Estudios de Edad Media de la Corona de Aragón (dalam bahasa Spanyol). 1: 193–284. OCLC694519776. Diarsipkan dari versi asli(PDF) tanggal 3 March 2016. Diakses tanggal 5 December 2015.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Martínez Díez, Gonzalo (2005). El Condado de Castilla (711-1038): la historia frente a la leyenda (dalam bahasa Spanyol). 2 volumes. Valladolid. ISBN84-9718-275-8.
Martínez Díez, Gonzalo (2007). Sancho III el Mayor Rey de Pamplona, Rex Ibericus (dalam bahasa Spanyol). Madrid: Marcial Pons Historia. ISBN978-84-96467-47-7.
Ubieto Arteta, Antonio (1963). Los reyes pamploneses entre 905 y 970. Príncipe de Viana (dalam bahasa Spanyol). Pamplona: Gobierno de Navarra: Institución Príncipe de Viana. hlm. 77–82. ISSN0032-8472. Diarsipkan dari versi asli tanggal 2023-07-28. Diakses tanggal 2021-04-16.
Sumber utama
Martín Duque, Ángel J. (1983). Documentación medieval de Leire (Siglos IX a XII) (dalam bahasa Spanyol). Pamplona: Diputación Foral de Navarra, Institución Príncipe de Viana. ISBN8423506258.
Ubieto Arteta, Antonio (1976). Cartulario de San Millán de la Cogolla (759-1076) (dalam bahasa Spanyol). Zaragoza: Anubar Ediciones. ISBN84-7013-082-X.
Ubieto Arteta, Antonio (1986). Cartulario de Siresa (dalam bahasa Spanyol). Zaragoza: Anubar Ediciones. ISBN84-7013-217-2.