The Citizens Theatre, in what was the Royal Princess's Theatre, is the creation of James Bridie and is based in Glasgow, Scotland as a principal producing theatre. The theatre includes a 500-seat Main Auditorium, and has also included various studio theatres over time. Under the leadership of James Bridie (Dr O.H. Mavor), the Citizens Company was based at first in the Glasgow Athenaeum. It moved in 1945 to its present site, the then Royal Princess's Theatre (opened 1878), where the building became the Citizens Theatre.