Archimedes
Archimedes was born around 287 BC in Syracuse, Sicily. Syracuse at the time belonged to Greece, and Archimedes was a Greek mathematician and scientist. He died in 212 or 211 BC in the same town being assassinated by a Roman soldier of the advancing Roman army. Archimedes was apparently so involved in his work on mathematics that he did not run even when the solder came to him.
It is believed that Archimedes learnt his mathematical art in Egypt, Alexandria, from the followers of Euclid. He came from an aristocratic family and during his long life invented a number of war devices. He is generally thought of as one of the most important mathematicians/scientists of the antiquity
Archimedes approximated the value of Pi.