groups of mountains, four nations (Celtic and Iberian), four mediæval kingdoms, and four modern dioceses can be remembered thus:
| i. | Snowdonia | Decangi | Gwynedd | Bangor |
| ii. | Berwyn | Ordovices | Powys | St Asaph |
| iii. | Plinlimmon | Demetae | Dyved | St David's |
| iv. | Black Mountains | Silures | Morgannwg | Llandaff |
3. The Romans. They made roads, built cities, worked mines.
| 50-78. | The Conquest. The Silures were defeated in 50, the Decangi in 58, the Ordovices in 78. |
| 80-200. | The Settlement. Wales part of a Roman province including Chester and York. |
| 200-450. | The struggle against the new wandering nations. The introduction of Christianity. |
| 450- | The House of Cunedda represents Roman rule. |
4. The English.
| 577. | Battle of Deorham. Wales separated from Cornwall. |
| 613. | Battle of Chester. Wales separated from Cumbria. |
I. THE WALES OF THE PRINCES
Isolated after the battles of Deorham and Chester, mediæval Wales begins to make its own history. The House of Cunedda represents unity, the other princes represent independence. English, Danish, Norman attacks from without.
I. 613-1063. The struggle between the Welsh princes and the English provincial kings. From the battle of Chester to the fall of Griffith ap Llywelyn.
(a) Between Wales and Northumbria, 613-700; for the sovereignty of the north. Cadwallon, Cadwaladr v. Edwin, Oswald, Oswiu.
(b) Between Wales and Mercia, 700-815 ; for the valley of the Severn. Rhodri Molwynog and his sons v. Ethelbald and Offa.
(c) Between Wales and the Danes, 815-1000. Rhodri the Great and Howel the Good.
