Conversation so far:
where does my last name garcia come from
Garcia was possibly a Basque surname called Gaztea, and later was Castilianized, into the medieval Kingdom of Castile, becoming García.
Where was the Kingdom of Castile located?
The Kingdom of Castile was a large and powerful state located on the Iberian Peninsula during the Middle Ages.
What language was spoken in the Kingdom of Castile?
Castilian, that is, Spanish, is the native language of the Castilians. Its origin is traditionally ascribed to an area south of the Cordillera Cantábrica

Question: when did the kingdom begin
Self-contained rewrite: when did the kingdom of castille begin