Sir Tony Blair, Gordon Brown and Sir Keir Starmer were among cabinet ministers and broadcasters who gathered to pay their last respects to Labour MP Jack Dromey.
Some mourners grievers struggled to contain their emotion with tears in their eyes during the funeral at St Margaret’s Church in in Westminster.
There was also a lot of joy shared with Mr Dromey's children paying heartwarming tributes during the service.
Deputy Labour leader Angela Rayner attended with Shadow Health Secretary Wes Streeting and Labour MP Jess Phillips.
Leader of the Commons Jacob Rees Mogg was also pictured in attendance.
Former Prime Minister Mr Brown gave a sincere eulogy, telling mourners Mr Dromey "remade history many times over" over the course of his political career.
Mr Dromey, a former trade unionist was married to party grandee Harriet Harman.
He died of natural causes aged 73 in his flat in his Birmingham constituency earlier this month.
In a speech at the service, Mr Brown told mourners to remember his “infectious enthusiasm”, “fighting spirit” and “relentless optimism”.
“From the start, Jack had a bigger mission, born of the intensity of his idealism and the courage of his convictions," Mr Brown said.
“He saw wrongs and wanted to right them, injustices and wanted to resolve them, and where there was unfairness, there Jack always was, fighting it.
“He was the ‘Jack of all campaigns’.
“‘Four quick points’ he’d say when you met him, and there were usually eight.
“And when he said ‘finally‘ that meant there were at least three more proposals to be acted on, as he ran a seemingly endless succession of landmark, ground-breaking, often life-changing campaigns, and made and remade history many times over.”
Sir Keir Starmer and broadcaster Trevor Phillips were pictured at the funeral service.
Sir Tony gave a Bible reading, while Mr Dromey’s daughter Amy Harman read an extract from her mother’s book A Woman’s Work.
The father-of-three had represented Birmingham Erdington since 2010.
Born in London in 1948, he had three children with Ms Harman, the former deputy Labour leader, who announced last month she will stand down as an MP after the next general election.
They married in 1982.
Mr Dromey joined the Labour frontbench as shadow housing minister in 2010 under then-leader Ed Miliband, who was also at the service.
Jess Phillips, Labour MP for Birmingham Yardley said after the service: “It was brilliant and funny and beautiful and a testimony to Jack.
“I just felt very much that Harriet and Jack will be very proud of their children who stood up very bravely and gave brilliant testimonies.”
