G%C3%B3mez Pereira

Gmez Pereira was a Spanish philosopher, doctor, and natural humanist from Medina del Campo. Pereira worked hard to dispel medieval concepts of medicine and proposed the application of empirical methods as for his philosophy, it is of the standard direction and his reasonings are a clear precedent of Ren Descartes. He was the first to propose the famous Cogito ergo sum, in 1554, commonly attributed to Descartes. He was famous for his practice of medicine, although he had many diverse occupations, such as owning businesses, engineering, and philosophy.

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Source: Wikipedia