1 of 9 Marjorie "Mo" Mowlam entered the House of Commons in 1987 as MP for Redcar. Five years later she was elected to the shadow cabinet.
2 of 9 Ms Mowlam was among a clutch of female Labour MPs from the period who went on to become high profile members of the government.
3 of 9 She was an early supporter of Mr Blair but eventually became disaffected with his premiership. She was diagnosed with a brain tumour in 1997 and wore a wig after her illness caused her hair to fall out.
4 of 9 Mr Blair was often at Hillsborough Castle with his Northern Ireland secretary in an attempt get the peace process back on track.
5 of 9 Ms Mowlam famously removed her wig in discussions leading to the signing of the 1998 Good Friday Agreement. She is pictured here sharing a joke with SDLP leader John Hume and Sinn Fein President Gerry Adams.
6 of 9 She visited Omagh after an explosion in August 1998 which killed 28 people - four months after the agreement was made.
7 of 9 In 1999, she received an honorary doctorate of civil law from her old university, Durham. As a student, she had a large picture of Jimi Hendrix on her wall.
8 of 9 Ms Mowlam told Labour's conference in 2000 that standing down as an MP at the upcoming election was the hardest decision she had ever made.
9 of 9 Her efforts in Northern Ireland won her a peace prize, awarded by Hillary Clinton in 2000.