Thus the conquest of the interior was practically complete.
There still remained, it is true, the subjugation of the west; but the west was brought under the English over-lordship by slow degrees, and in a very different manner from the east and the south coast, or even the central belt.

Cornwall finally yielded under AEthelstan; Strathclyde was gradually absorbed by the English in the south and the Scottish kingdom on the north; and the last remnant of Wales only succumbed to the intruders under the rule of the Angevin Edward I.
There were, in fact, three epochs of English extension in Britain.

The first epoch was one of colonisation on the coasts and along the valleys of the eastward rivers.

The second epoch was one of conquest and partial settlement in the central plateau and the westward basins.

The third epoch was one of merely political subjugation in the western mountain regions.