Who "invented" oatmeal?

Who invented oatmeal? [3583C]

I assume you mean the consumption of oatmeal as a breakfast cereal.  Humans began eating oatmeal for breakfast thousands of years ago – most commonly in the British Isles – so it’s impossible to know who “invented” it (but I’m going to say it was a guy named Conor, who lived near the current town of Dunfanaghy on the Donegal coast around 420 BC).

Ironically, since he was gout-ridden at the time of his death and could’ve benefitted from eating it regularly, Dr. Johnson referred to oatmeal as “a grain, which in England is generally given to horses, but in Scotland supports the people.”