When was the Spanish language first spoken?

I mean the Spanish language spoken in Spain not Latin America does anyone know when was the Spanish language was first spoken

What language was spoken in Mexico before the Spanish came to Mexico?

And it wasn’t spanish, only knowledgeable answers please. Is remants of that original language in the spanish language of today? Are there any Mexicans who know how to speak the original language fluently? Is it taught in schools or universities in Mexico?
Skincancer, I gave you a thumbs up for your pithy post.
The [...]