• Born: Between 1030 and 1035
• Married: Before 7 Dec 1057
• Died: After 29 Nov 1074, Peñalén, Guadalajara, Castile-La Mancha, Spain

  Research Notes:

"Sancius rex" granted property to "senior Sancio Furtuniones" by charter dated 7 Dec 1057, confirmed by "…Infante domno Santio et uxor eius domna Contanza…".

Señor de Uncastillo y Sangüesa. Salazar y Acha discusses his marriage. The Crónica Najerense records that “infans domnus Sancius, quem rex Garsias Pampilonensium ex concubina habuerat” abducted “filiam regine Stephanie”, who was betrothed to “Santius rex”, and took her to the court of the Moorish king of Zaragoza and later to Ramiro I King of Aragon, triggering the war between Castille and Aragon during the course of which the Aragonese king was killed in 1064. Sancho IV King of Navarre granted “unas casas en la ciudad de Calahorra” to “germano meo domno Sancio et uxori vestra vel germana mea domna Constanza” by charter dated 29 Nov 1074. ¹