Astorkhan, there was a thread called What is Vestapol? in which the history of the names "Vestapol" and "Spanish" tuning are discussed.

I have to admit, I used the term "Vestapol" rather than my usual phrase "open D" because along with "DADGAD" it gave a Middle-Eastern flavor to the title. (Although I can't see the relationship with Rocky and his friends.)

Murray