The shape and form of the Alcázar was not known until the reign of King Alfonso VIII (1155–1214), however early documentation mentioned a wooden stockade fence. It can be concluded that prior to Alfonso VIII's reign, the Muslim era structure was no more than a wooden fort built over the old Roman foundations. Alfonso VIII and his wife, Eleanor of England, made this alcázar their principal residence and much work was carried out to erect the beginnings of the stone fortification we see today.