1251: Blwyddyn
12g - 13g - 14g 1200au 1210au 1220au 1230au 1240au - 1250au - 1260au 1270au 1280au 1290au 1300au 1246 1247 1248 1249 1250 - 1251 - 1252 1253 1254 1255 1256
Digwyddiadau
- Llyfrau -
Genedigaethau
Marwolaethau
- Ibn Sahl o Sevilla
- 25 Ionawr - Harri II o Nassau
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