The foundations date back to the 1170s when Strongbow, the earl of Pembroke, had it rebuilt as a stone structure.
Strongbow was the earl of Pembroke during the 1170s.
mnli hypothesis: Strongbow was the earl of Pembroke during the 1170s. premise: The foundations date back to the 1170s when Strongbow, the earl of Pembroke, had it rebuilt as a stone structure.