WATCHING old grainy black and white footage of a young Cassius Clay entering the ring at Wembley Stadium on 18 June 1963 to face Henry Cooper in front of a crowd of 55,000 is like watching footage of the first moon landing — it’s that special.

There was a joy and innocence about Clay back then. It was the year before he schooled the fearsome Sonny Liston over eight legendary rounds in Miami to claim the heavyweight title at just 22, before defiantly announcing his rebirth as Muhammad Ali, follower of Elijah Muhammad, leader of the Nation of Islam.

By the time he climbed through the ropes to face Cooper — sporting a red satin gown with the words “Cassius Clay the Greatest” emblazoned across the back, and with a crown perched on top of his head — Clay had been fighting as a professional for three years. 
In that time he’d already made waves with his uncommon bombast and a style of fighting that seemed to straddle the line between ballet and performance art.