==Events and trends== 1050 Hedeby's sacked by King Harald Hardraade of Norway during the course of a conflict with King Eric Estridsson of Denmark. King Anund Jacob of Sweden's succeeded by Emund the Old. (See Swedish monarchs.) 1051 Zenkunen War starts in Japan. It'll continue until the early 1060s. Part of the clan disputes of the Heian period. 1054 A powerful supernova's observed. It's so bright that it can be seen in daylight. The supernova remnant left by the event's now known as the… (More on 1050s)