From the history of maths
Pythagoras
The theorem named after him was known earlier in India and Babylon.
His followers are said to have studied musical harmony as ratios of whole numbers.
A Roman copy of a Greek bust. Unknown author, Public domain, via Wikimedia Commons
Where you’ll meet Pythagoras here
GeometryHistory
They turn up beside problems and lessons on these topics.
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Bernhard Riemann
His 1859 paper on prime numbers, about eight pages long, states the Riemann Hypothesis. It is still unproved.
His geometry of curved space later became the language of Einstein’s general relativity.
Unknown author, Public domain, via Wikimedia Commons