Edmund Ironside was an Anglo-Saxon king who ruled England for a brief period of time during the early 11th century. While there may not be many synonyms for his name, there are some other words and phrases that could be associated with him. For example, he was known for his bravery and military prowess, so words like valorous and courageous could be used to describe him. Additionally, his reign was marked by conflict and unrest, so terms like tumultuous and turbulent could also be used. Finally, Edmund Ironside was often associated with the Battle of Assandun, which was a significant event in his reign and could be used as a synonym of sorts.