From India
Madhava of Sangamagrama
He founded the Kerala school of astronomy and mathematics, which found infinite series for π, sine and cosine around 1400, long before they appeared in Europe.
The series for π shown here is often called the Madhava–Leibniz series. No portrait of him survives.
Madhava’s series for π, c. 1400
No portrait of Madhava of Sangamagrama survives, so we show the mathematics instead.
Where you’ll meet Madhava of Sangamagrama here
CalculusHistory
They turn up beside problems and lessons on these topics.
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Thomas Phillips, Public domain, via Wikimedia Commons