There will be a celebration today at the home of a Canadian credited with one of the greatest medical discoveries of the 20th century.

A three-metre-high sculpture by local artist Daniel Castillo will be unveiled at Sir Frederick Banting's house in London, Ontario.

That's where Banting awoke at two in the morning 90 years ago today with the brilliant idea of using insulin to treat diabetes.

His discovery has saved millions of lives around the world and it also won Banting a Nobel Prize.

Attorney General Chris Bentley is among those invited to attend today's sculpture's unveiling ceremony at the Banting house, which is a national historic site.

With files from The Canadian Press