He served in Churchill's government and held many major offices of state, famously resigning as foreign secretary over the Falklands invasion.
Lord Peter Carrington, the former Defence Secretary who negotiated a defence agreement with former Prime Minister Dom Mintoff, has passed away at the age of 99.
"He was a much loved and widely respected member of the House of Lords for almost eight decades, and served with great honour and integrity in government".
Prime Minister Theresa May said he was "respected globally for his remarkable lifetime of service", adding: "There can be few people who have served our country for as long, and with such dedication".
He took up his seat in the Lords in 1946 and went on to become the oldest and longest-serving member of Parliament's second chamber. It was a huge honour having him to Chequers and listening to his stories of working with every Conservative leader from Winston Churchill onwards.
Penny Mordaunt, the worldwide development secretary, said she first met Carrington when he was the chancellor of Reading University where she was studying.
Cabinet office minister David Lidington tweeted on Tuesday he was "sorry to learn of the death of my constituent Lord Carrington".