Events in History
- Apr 29 Battle at Monte Levunium: Byzantium Emperor Alexius I beats Petshegene force invading from the north
- Jun 17 Floris II de Vette becomes earl of Holland
- Oct 23 Tornado (possible T8/F4) strikes the heart of London killing two and demolishing the wooden London Bridge (OS 17 Oct)
Historical Figures Who Died in 1091
- May 31 Hendrik van Verdun, bishop of Luik (1075-91), dies
- Jun 17 Dirk V, count of Holland (1061-91), dies
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