French philosopher Rene Descartes is born at La Haye in Touraine, France. Rene Descartes will be widely regarded as the "founder" of the modern age of philosophy because he challenges and questions all of the traditional systems of thinking, most of which were founded upon Aristotle's ideas.
Although Rene Descartes will come to be seen primarily as a philosopher, he will also publish many book on pure mathematics and in scientific fields like optics. For Descartes, philosophy will be an integral part of other fields like math and science. He likens philosophy to a tree: the roots are metaphysics, the trunk physics, and the branches individual fields like mechanics.
Rene Descartes will believe in the unity of all knowledge and all field of human study. Everything is linked and everything depends upon a proper philosophical grounding, but the "fruit" comes from the branches of science.