The original cathedral was at Old Sarum, an Iron Age hill fort that had been taken over by the Saxons and strengthened by Alfred the Great. There was a small Saxon community here and the Normans, recognizing the importance of this strategic site, built a castle here. In 1075 it was decided that there should be a cathedral at Old Sarum to replace that of Sherborne and work began under the direction of Bishop, later Saint, Osmund. The cathedral was consecrated in 1092. The cathedral was rebuilt and enlarged by Bishop Roger, a powerful man and definitely unsaintly. From 1140 there was friction between the clergy at the cathedral and the soldiers at the castle on this rather small hill top site. Two bishops, Hubert Walter and Herbert Poore, are believed to have had the idea for moving the cathedral to its present site in the 1190s.