Plaid Cymru's leader, Rhun ap Iorwerth, described the party's triumph in the Caerphilly Senedd by-election as a "reset for Welsh politics".
The party secured 47% of the vote in a record turnout of 50%, with Reform UK coming second with 36% and Labour a distant third with 11%.
The result was terrible for the "two big beasts of Westminster politics" - Labour was "humbled, pummelled, crushed", while the Tories got just 2%.
Author's summary: Plaid Cymru wins historic by-election in Caerphilly.