860 Swedish Vikings attacked Constantinople.
1053 Pope Leo IX
was taken prisoner by the Normans.
1155 German King Frederick Barbarossa was
crowned Holy Roman Emperor.
1178 Proposed time of origin of the lunar crater
Giordano Bruno - five Canterbury monks reported an explosion on the moon (only known observation).
Parliament of Ireland met at Castledermot in County Kildare, the first
definitively known meeting of this Irish legislature.