Keiller's marmalade is named after its creator James and Janet Keiller (nee Mathewson, 1737-1813), and is believed to have been the first commercial brand of marmalade in Great Britain. It was made by James Keiller in Dundee, Scotland, later creating James Keiller & Son, a brand name which became iconic in the 18th and 19th centuries, and has been sold several times. The true story is that Janet Keiller did not invent marmalade. Marmalade existed in Spain and Portugal since at least the 15th century and a Scottish recipe for orange marmalade appears in "Mrs McLintoch's Receipts (sic)" of 1736.