1670s, "of or pertaining to tragedy or dramatic acting," from Greek Thespis, semi-legendary 6c. B.C.E. poet of Icaria in Attica, often called the Father of Greek Tragedy. The literal meaning of the name is "inspired by the gods."
"an actor," 1827, from thespian (adj.). Short form thesp is attested from 1962.
the movie director had thespian cooperation