Told at a session at Bromyard.

the father of Garibaldi, the clown, was a stage performer who had extremely strong legs and his act consisted of amazing leaps. the tune Iron Legs was named after him.

So the questions are -
Who was Garibadli's father? yea yea Mr Garibaldi (probably)
and what is the provenence of the tune? age, composer, etc

My searches via alltheweb.com have not revealed anything that I can see as relevant.