1945
Gwynfor Evans elected President of Plaid Cymru
1953
Start of the Parliament for Wales campaign – 240,652 support the petition
1955
Cwm Tryweryn campaign against the drowning of the Welsh speaking village of Capel Celyn
14 July 1966
Gwynfor Evans wins the Carmarthen seat to become the first Plaid Cymru MP in an historic by-election