Events February — Battle of Mortemer: The Normans defeat a French army as it's caught pillaging and plundering. King Henry I of France withdraws his main army from Normandy as a result. April 30, Rosdalla Ireland: Earliest known European tornado. July 4 — The SN 1054 supernova is recorded by the Chinese, Arab and possibly Native Americans near the star ζ Tauri. For 23 days it remains bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952). Jul… (More on 1054)