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