Spanish had evolved from Vulgar Latin. With other surviving influences such as from Basque and Celtiberian, as well as Germanic languages wia from Visgoths.
The first Latin-to-Spanish grammar had been written in Salamanca, Spain, in 1492, by Elio Antonio de Nebrija. When it was presented to Isabel de Castilla, she asked "Para que querria yo un trabajo como este, si ya conozco la lengua?" Which was translated as : ("What would I want a work like this for, if I already know the language?"), to which he replied, "Su alteza, la lengua es el instrumento del Imperio" and was also translated as : ("Your highness, the language is the instrument of the Empire.") In his introduction to the first Spanish grammar, which had been dated August 18, 1492, Nebrija wrote that "... language was always the companion of empire."
From the time of the 16th sentury and onwards, the language had been taken to the Americas and the Spanish East Indies via Spanish colonisation.The influence on the Spanish language from the 17th century from Miguel de Cervantes Saavedra had been so great that Spanish often called the language la lengua de Cervantes.
But then, in the 20th century, Spanish was introduced to Equatorial Guinea and the Western Sahara, and also the areas of the United States that had not been apart of the Spanish Empire, such as Spanish Harlem in New York City.