Was Marmite developed and marketed before Vegemite?

Marmite was invented in the late 19th century when Justus von Liebig a scientist, found out that brewer's yeast could be bottled and eaten.

https://en.wikipedia.org/wiki/Marmite

Vegemite is also made from brewer's yeast. Vegemite first appeared on the shopping shelves in 1923.


https://en.wikipedia.org/wiki/Vegemite

Marmite was invented in the late 19th century when German scientist Justus von Liebig discovered that brewer's yeast could be concentrated, bottled and eaten. In 1902 the Marmite Food Extract Company was formed in Burton upon Trent, Staffordshire, England by the Gilmour family, with Marmite as its main product and Burton as the site of the first factory.

https://en.wikipedia.org/wiki/Marmite

Vegemite was invented in 1922 by food technologist Cyril P. Callister when, following the disruption of British Marmite imports after World War I, his employer, the Australian company Fred Walker & Co., gave him the task of developing a spread from the used yeast being dumped by breweries.

https://en.wikipedia.org/wiki/Vegemite

Therefore, yes, Marmite in 1902 and Vegemite in 1922.