who won this battle?
William The Conqueror.
William the Conqueror
Harold's body was identified the day after the battle, either through his armour or marks on his body. The English dead, who included some of Harold's brothers and his housecarls, were left on the battlefield. 
who is reginald de warenne? He was an Anglo-Norman nobleman and royal official. what royal service was he a part of? He was a royal justice. can you name some of his family members? Son of William de Warenne and Isabel de Vermandois. did any of them had royal title? William de Warenne, the second earl of Surrey. what can you tell about this rank? It is a title in the Peerage of England that has been created five times. It was first created for William de Warenne, a close companion of William the Conqueror. can you name some of these earls? No. where was the conqueror that you mentioned born? Falaise, a Duchy of Normandy. which place was he reigning? England. did any battle take place during his reign? Yes, the Battle of Hastings.
wiki:19645092
William the Conqueror [SEP] Battle of Hastings
William of Jumièges claimed that Harold was killed by the duke. The Bayeux Tapestry has been claimed to show Harold's death by an arrow to the eye, but that may be a later reworking of the tapestry to conform to 12th-century stories in which Harold was slain by an arrow wound to the head. Harold's body was identified the day after the battle, either through his armour or marks on his body. The English dead, who included some of Harold's brothers and his housecarls, were left on the battlefield. Gytha, Harold's mother, offered the victorious duke the weight of her son's body in gold for its custody, but her offer was refused.