Diophantus Alexandrinus

Diophantus of Alexandria was a Greek mathematician, most probably active in the 3rd century CE, often called 'the father of algebra.' His principal work, the 'Arithmetica,' is a collection of problems solved with what became known as Diophantine equations, seeking whole-number or rational solutions, and it strongly influenced later mathematics, including the work of Fermat. His dates are not securely known.