BBC News quotes a tribute to him from Kirsty Williams, leader of the Welsh Liberal Democrats and AM for the same constituency:
"a man of immense honour and decency who was loved and respected by his constituents, colleagues and by politicians of all parties.
"He will be remembered particularly as a champion for the rural communities in which he lived and an expert on agriculture, which he worked in all his professional life.
"As Leader of the Welsh Liberal Democrats, he was a passionate advocate for Welsh devolution.
"His role in achieving a 'Yes' vote in the 1997 referendum establishing the National Assembly for Wales will be long remembered."