John Taylor, who has served as a councillor for more than 28 years, has died peacefully at home aged 77.
Coun Taylor was a retired farmer and estate manager who has held a number of offices including that of leader of the former Alnwick District Council.
He served on the district council from 1986 until 2009 and has been a serving member of Northumberland County Council since 2001.
Living at Denwick, he has also been a parish councillor for his ward.
Members across Northumberland County Council have paid warm tributes to Coun Taylor.
Coun Grant Davey, leader of Northumberland County Council said: “We are very saddened to hear the news of Coun Taylor’s death.
“He was a long-standing and much-valued councillor who has made a huge contribution to his ward, to the former Alnwick District Council, and more recently to Northumberland County Council. He will be sadly missed by all his colleagues and friends at Northumberland.”
The Northumberland flag at County Hall, in Morpeth, will fly at half-mast from today until the day after Coun Taylor’s funeral.