The Rook has nothing to do with blackbirds.
There are several versions, but the one I find the most compelling is:
The Indian pre-chess game, Chaturanga*, used a piece called the "rukh," that represented an elephantine war carriage used by the Indian army up until the 5th century.
You should look at your own stuff.
https://www.chess.com/forum/view/community/murray-the-great#comment-64832479
See the chariot? Drawn by 4 horses.

A quick Google search of the Charlemagne Chessmen.
https://en.wikipedia.org/wiki/Charlemagne_chessmen

https://www.chess.com/forum/view/general/why-is-a-castle-called-a-rook?page=11#comment-89227077
I saw that opera in a foreign language movie theater with a Black lady who was a semi-pro singer, who studied opera.
I saw it at E Street Cinema (It's on E Street in Washington DC).
The movie was a recording of a stage production. It was the closest thing to seeing it live.
I took 2 years of Latin in High School. And I was learning a little bit of Spanish and French.
I could understand the movie almost verbatim.
You can too. It is not that hard, especially if your language is Latin derived.
https://www.dropbox.com/s/gplajiw1rtp16ey/O%20Mio%20Babbino%20Caro.docx?dl=0
After watching that Opera, I immediately knew what "annulus" means on Stargate SG-1. It means "ring". Those TV writers, so precise with their language.
15:11
a comperar l'anello!
to buy the ring!
I went to see Tosca by myself, at E Street Cinema.
https://www.dropbox.com/s/enmhshkvxr4deo9/Vissi%20d%E2%80%99arte.docx?dl=0
I showed my translation to an Italian lady at work, and she said, verbatim:
"You must have been Italian in your previous life."