History of the Welsh language
Denbighshire was the only other county where a majority could still speak Welsh, here, 51.0% could speak Welsh and 94.0% could speak English. As for larger urban areas, Aberdare was the only one where a majority could still speak Welsh, here 59.0% could speak Welsh while 95.4% could speak English. In Cardiff, Wales' capital, 5.2% of people could speak Welsh, while 99.7% of people could speak English. 
At a district level, Llanfyrnach rural district in Pembrokeshire had the highest percentage of Welsh speakers; at 97.5%, while Penllyn rural district in Merioneth had the highest percentage of Welsh monoglots; at 57.3%. Bethesda urban district in Carnarvonshire was the most Welsh speaking urban district in Wales; 96.6% of the district's population could speak Welsh.
Rotvælsk
Rotvælsk was a secret language (also known as a cant or cryptolect) that was spoken in Denmark from early modern times until the turn of the 20th century. Rorvælsk was also known under several other names. It is now extinct. Rotvælsk was used by a social group known as Natmændsfolk who did simple craftsmanship, demeaning and unclean work or panhandled to survive. Both the social group and the language changed through the centuries, but remained associated with crime, loose morals, poverty and low social status in the eyes of the surrounding population. The social group and their language have often been confused with Romani people and the Romani language, though they do not seem to have had a different ethnic origin than most danes at that time.