- Baron Henry "Hotspur" De Percy
Birth - 20 May 1364 (103 year anniversary) - , Alnwick, NORTHUMBERLAND, England - Robert Clifford
- Aveline Fitzjohn
- Maurice Fitzgerald
Death - 20 May 1257 (210 year anniversary) - , Youghal Monaster, , Ireland - Elisabeth, Princess Of Austria
- Helgi "Magri" Eyvindsson
Death - 20 May 908 (559 year anniversary) - , , Eyjafjardar, Iceland
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