In exchange for helping him establish a state whose clergy could speak this language, a man promised Charles VI he would recognize Antipope Benedict XIII in the “Pennal Letter.” Each day, the last student wearing this language’s namesake "not," which was given to kids caught speaking it, would be beaten. Revolting against the high tolls charged by Turnpike Trusts, speakers of this language blackened their faces, dressed as women, and tore down gates during the (*) Rebecca Riots. Advocates for this language including Saunders Lewis were imprisoned for protesting an air force base constructed under Stanley Baldwin. This language, which was suppressed via two mid-1500s Acts of Union, was the first language spoken by (10[1])David Lloyd George. For 10 points, name this language spoken in a UK constituent country with capital at Cardiff. ■END■