- 1287 – cwympodd Castell y Dryslwyn i'r Normaniaid
- 1820 – ganwyd y bardd a'r ysgrifwr Evan Jones (Ieuan Gwynedd)
- 1877 – bu farw Thasuka Witco ("Crazy Horse"), pennaeth llwyth brodorol y Lakota yng Ngogledd America
- 1927 – agorwyd Coleg Harlech, syniad Thomas Jones, Rhymni.
- 1997 – bu farw'r Fam Teresa, lleian ac enillydd Gwobr Heddwch Nobel
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