Ketchup existed before anyone outside the Americas had ever seen a tomato. Originally this sauce was made out of pickled fish. It originated in Eastern Asia; the word ketchup is used in Chinese, Malay and Indonesian (e.g., kecap manis - traditional spelling 'kitjap manis').
Mayonnaise is generally said to have been created by the chef of Louis François Armand du Plessis, duc de Richelieu in 1756, to celebrate the French military victory over the British at the port of Mahon (the capital of Minorca in the Balearic Islands, Spain).
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