The other two answers are correct but a little more could be said about the man.
1945: Jim Callaghan was elected as the MP for Cardiff South
1947: Made junior transport minister by Clement Attlee
1964: Appointed chancellor of the exchequer
1967: Made home secretary
1974: Became foreign secretary under Harold Wilson
1976: Succeeded Harold Wilson as prime minister
1979: Lost power as Margaret Thatcher wins general election
He died at the age of 93 (11 days after the death of his wife,91) and was the longest living former British PM in history.
It was a stormy period for him as Prime Minister as he ruled over the imfamous "Winter of Discontent" in 1978. This was when trade unions carried out strikes that brought the country to a standstill, Lord Callaghan refused to hold an early election which may have delivered a Labour victory. As as result of a power struggle with the far left, including the unions, it made way for a conservative government led by M. Thatcher.
