* Vulgar Latin: Spoken Latin in the Iberian Peninsula, which differed from the standardized Classical Latin used in literature and administration.
* Other Romance languages: Influences from neighboring languages like Portuguese and Catalan.
* Arabic: Due to the Moorish occupation of Spain, Arabic vocabulary and grammatical structures were incorporated.
* Indigenous languages: Influence from languages spoken by the original inhabitants of Spain, particularly in vocabulary related to flora and fauna.
Timeline:
* 3rd century AD: Vulgar Latin began to diverge from Classical Latin in the Iberian Peninsula.
* 8th-15th centuries: Arabic influence and the rise of various regional dialects.
* 15th century: Castilian, the dialect spoken in the Kingdom of Castile, became dominant and began to be standardized through literature and administration.
* 16th century: Spanish, based on Castilian, becomes established as the official language of the Spanish Empire.
Therefore, it's more accurate to say that Spanish evolved gradually over centuries rather than having a specific invention date.