In 912, he took the main role in the Castilian offensive to the river Duero, settling the old villages of Haza, Clunia and San Esteban de Gormaz.
The village lies between the bank of River Duero and a small hill, 70 km east of the capital of the province (Soria), 28 km from Tiermes and 45 km from Aranda de Duero.
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He captured the fortresses of San Esteban de Gormaz, Berlanga and Vadorrey, and afterwards proceeded through Santiuste, Huermeces and Santamara as far as the Roman road that lay between Toledo and Zaragoza.