In what country did Spanish language originate?

The Spanish language did not originate in any specific country. It originated in the Iberian Peninsula, which is shared by Spain and Portugal. The Spanish language is a Romance language that evolved from Vulgar Latin, which was spoken in the Roman Empire. The Vulgar Latin spoken in the Iberian Peninsula gradually evolved into Spanish over time, influenced by various other languages and cultures that came into contact with the region, such as Celtic, Arabic, and Gothic.