The year of three prime ministers

It was 1827. As Jon Craig writes on the Sky News Boulton & Co. blog:

There were three Prime Ministers in 1827, but not all in the Commons.

1. The Earl of Liverpool, who resigned as Prime Minister after suffering a stroke.

2. George Canning, who became PM on April 10, 1827, but died from pneumonia on August 8, having been Prime Minister for just 119 days.

3. Frederick Robinson, Viscount Goderich, who didn't last much longer, just 130 days.

Canning remains Britain's shortest serving Prime Minister. But Gordon Brown, who succeeded Tony Blair on June 27, could claim that unenviable record if he lost a November election to David Cameron.