Deaths on January 1

Haakon III of Norway (b. 1170)

Haakon III Sverresson (Norwegian: Håkon Sverresson, Old Norse: Hákon Sverrisson) (c. 1183 – 1 January 1204) was King of Norway from 1202 to 1204.

12 Apr

Siege of Constantinople (1204)
The Crusaders of the Fourth Crusade breach the walls of Constantinople and enter the city, which they completely occupy the following day.
13 Apr

Fourth Crusade
Constantinople falls to the Crusaders of the Fourth Crusade, temporarily ending the Byzantine Empire.