Plaid was formed in 1925 and won its first seat in the UK Parliament in 1966. The party holds three of 40 Welsh seats in the UK Parliament, 12 of 60 seats in the Senedd,[28] and 202 of 1,231 principal local authority councillors.[24] It is a member of the European Free Alliance.
^ abHamilton, Paul (2008). "Nationalism and Environmentalism". Nations and Nationalism: A Global Historical Overview. Vol. 3. ABC-CLIO. p. 881.
^ abSchrijver, Frans (2006). Regionalism After Regionalisation: Spain, France and the United Kingdom (Thesis). Amsterdam University Press. p. 330. hdl:11245/1.288031. ISBN978-90-5629-428-1.
^Siaroff, Alan (2000). Comparative European Party Systems: An Analysis of Parliamentary Elections Since 1945. Garland. p. 467. ISBN978-1-138-88809-8.
^ abElias, Anwen (2006). "From 'full national status' to 'independence' in Europe: The case of Plaid Cymru — the Party of Wales". European Integration and the Nationalities Question. Routledge. p. 194.
^Driver, Stephen (2011). Understanding British Party Politics. Polity Press. p. 176. ISBN978-0-7456-4078-5.
^Dunphy, Richard (2004). Contesting capitalism?: Left parties and European integration. Manchester University Press. p. 157. ISBN0-7190-6803-7.
^McEwen, Nicola; Parry, Richard (2005). "Devolution and the preservation of the United Kingdom welfare state". The Territorial Politics of Welfare. Routledge. p. 53.