Thanks, Bingley. Then "Roscian" is just an alternative to "Thespian".
thespian
adj : of or relating to drama; "the movie director had thespian
cooperation"
n : a theatrical performer [syn: actor, histrion, player,
role player]


Source: Webster's Revised Unabridged Dictionary (1913)

Thespian \Thes"pi*an\, a. [From L. Thespis, Gr. ?, the founder
of the Greek drama.]
Of or pertaining to Thespis; hence, relating to the drama;
dramatic; as, the Thespian art. -- n. An actor.