He was born in Norfolk in 1777 to Robert Colman (1749-1807) and Mary (née Harmer). Trained as a miller, Jeremiah Colman managed a mill at Bawburgh before buying his own mill at Pockthorpe in 1803.
In 1814 he bought the mustard business of Edward Ames and moved it to a mill at Stoke Holy Cross where he started crushing mustard seed. In 1823, having no children of his own, he went into partnership with his nephew James. By 1829 J & J Colman was selling mustard in London.
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