May 17 Guido van Arezzo, Italian music theorist, dies on this day in history.
Nov 01 Henry IV, German emperor (1056/84-1105) [or Nov 11] on this day in history.
Nov 01 Henry IV, German emperor (1056/84-1105) [or Nov 11] was born on this day in history.
Nov 11 Henry IV, Holy Roman Emperor (d. 1106) was born in the year 1050.
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May 17 On this day in history guido van Arezzo, Italian music theorist, dies
Important Dates And Events In History - Hisdates.Com