The Monastery Of San Pedro De Arlanza, San Pelayo - The Monastery Of San Pedro De Arlanza, Founded In 912 By Gonzalo Fernandez, Father Of Count Fernan Gonzalez. Important Role In The Founding Of Castile. With 1100 Years Of History. 200 Years Ago Was Abandoned By The Monks. In Recent Times, Was Plundered To Leave It On The Current State Of Ruin. Photo