820: Blwyddyn
8g - 9g - 10g 770au 780au 790au 800au 810au - 820au - 830au 840au 850au 860au 870au 815 816 817 818 819 - 820 - 821 822 823 824 825
Digwyddiadau
Genedigaethau
- Rhodri Mawr, brenin Gwynedd (tua'r flwyddyn yma)
Marwolaethau
- 24 Rhagfyr - Leo V, Ymerawdwr Bysantaidd (g. 775)
- Tang Xian Zong, ymerawdwr Tsieina
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