Sancho III of Navarre
In 1016 Sancho III of Navarre and Sancho García of Castile established by agreement the border between their respective realms. Sometime later, probably between 1028 and 1054, Fortún Ochoiz and his neighbour across the border in Castile, Nuño Álvarez de Carazo, re-confirmed the division and the frontier. This act, confirming only the border as it passed through the , is preserved in a short notice in a document from the "Becerro Galicano" cartulary of the Riojan monastery of San Millán de la Cogolla. It is the only record of the division of 1016, only the surveying for which was perhaps undertaken, the hypothetical treaty never being drawn up or confirmed; otherwise, it is lost. It is also possible that Fortún and Nuño confirmed the old frontier in an act of rebellion, without authority from their respective lords.