Gower was made subject to the ordinary law of England by its inclusion in 1535 in the county of Glamorgan as then reorganized; its chancery, which from about the beginning of the 14th century had been located at Oystermouth Castle, came to an end, but though the Welsh acts of 1535 and 1542 purported to abolish the rights and privileges of the lords marchers as conquerors, yet some of these, possibly from being regarded as private rights, have survived into modern times. For instance, the seignior maintained a franchise gaol in Swansea Castle till 1858, when it was abolished by act of parliament, the appointment of coroner for Gower is still vested in him, all writs are executed by the lord's officers instead of by the officers of the sheriff for the county, and the lord's rights to the foreshore, treasure trove, felon's goods and wrecks are undiminished.
The characteristically English part of Gower lies to the south and south-west of its central ridge of Cefn y Bryn. It was this part that was declared by Professor Freeman to be "more Teutonic than Kent itself." The seaside fringe lying between this area and the town of Swansea, as well as the extreme north-west of the peninsula, also became anglicized at a comparatively early date, though the place-names and the names of the inhabitants are still mainly Welsh. The present line of demarcation between the two languages is one drawn from Swansea in a W.N.W. direction to Llanrhidian on the north coast. It has remained practically the same for several centuries, and is likely to continue so, as it very nearly coincides with the southern outcrop of the coal measures, the industrial population to the north being Welsh-speaking, the agriculturists to the south being English. In 1901 the Gower rural district (which includes the Welsh-speaking industrial parish of Llanrhidian, with about three-sevenths of the total population) had 64.5% of the population above three years of age that spoke English only, 5.2% that spoke Welsh only, the remainder being bilinguals, as compared with 17% speaking English only, 17.7% speaking Welsh only and the rest bilinguals in the Swansea rural district, and 7% speaking English only, 55.2% speaking Welsh only and the rest bilinguals in the Pontardawe rural district, the last two districts constituting Welsh Gower.