Apart from being Australia's second longest-serving governor-general and introducing the first version of Medicare, Bill Hayden is probably best known for being a vocal and even hostile atheist.
Despite this, Gough Whitlam once told him, "Comrade, the Catholic Church will get you in the end".
It seems he was right.
Much to everyone's surprise, Mr Hayden was baptised last month at the age of 85.
Mr Hayden was treasurer and minister for social security in the Whitlam Government, foreign minister under Bob Hawke and then appointed governor-general in 1989.
One aspect of that last appointment caused quite a stir — the atheist and one-time republican was the first governor-general to make an affirmation, rather than an oath on the Bible.
John Howard said appointing Mr Hayden governor-general was "a bit like appointing an atheist as Archbishop of Canterbury".
But it was four years ago when things really took a turn.
Mr Hayden spent seven months in hospital after a stroke, which gave him a lot of time to think.
"Don't think I was an atheist just by chance. I thought a lot about it, and I still have questions," he said.
Mr Hayden says the baptism ceremony meant a lot to him.
"When I went into the church that day, it was a hot day outside, and inside was very cool. It felt like a sanctuary, and I felt elevated in my chest, it was sort of ethereal," he said.
"And I thought, 'I've always been here, I shouldn't have wandered off'.