317: Blwyddyn
3g - 4g - 5g 260au 270au 280au 290au 300au - 310au - 320au 330au 340au 350au 360au 312 313 314 315 316 - 317 - 318 319 320 321 322
Digwyddiadau
- 1 Mawrth — Crispus a Cystennin II, meibion yr Ymerawdwr Rhufeinig Cystennin I, a Licinius iunior, mab Licinius, yn cael y teitl Caesares
Genedigaethau
- 7 Awst — Constantius II, Ymerawdwr Rhufeinig
Marwolaethau
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