Kellogg's was started by a man named Will Keith Kellogg, who had studied up to sixth grade, and his brother Dr John Harvey Kellogg. they were Seventh Day Adventists, managing a sanatorium in the US and looking to provide a vegetarian diet for the inmates. By accident, in trying to save some boiled wheat one day, they put it under a roller, expecting dough. Instead, they got flakes. When they roasted the flakes and fed them to their patients, they simply loved it!
Encouraged, the brothers experimented with corn and that is how cornflakes were first created. They applied for a patent on 31 May 1895 and so the journey began.