He is a fervent nationalist committed to an independent Wales.
In the 1960s, he was imprisoned twice for bombing the site of the future Llyn Celyn reservoir but later turned to the democratic route,[1][2][3] becoming the chairman of the Independent Wales Party as well as a member of, at different times, both the Welsh Labour Party and Plaid Cymru.
[4][5] In the summer of 2009, he was reported to the authorities for leaving the bodies of several dead sheep to rot in his fields.
The film was nominated for a BAFTA Cymru award.
[7] He also wrote an autobiography, entitled Tryweryn: A Nation Awakes.