the loss of that most valuable treasure: the immortal soul." In spite of such laws, a few writers tried their hand at playwriting. Most likely, the first plays written in America were by European-born authors—we know of original plays being written by Spaniards, Frenchmen and Englishmen dating back as early as 1567—although no plays were printed in America until Robert Hunter's Androboros in 1714. Still, in the early years, most of the plays produced came from Europe; only with Godfrey's The Prince of Parthia in 1767 do we get a professionally produced play written by an American, although it was a last-minute substitute for Thomas Forrest's comic opera The Disappointment; or, The Force of Credulity, and although the first play to treat American themes seriously, Ponteach; or, the Savages of America by Robert Rogers, had been published in London a year earlier. 'Cato', a play about revolution, was performed for George Washington and his troops at Valley Forge in the winter of 1777–1778. The Revolutionary period was a boost for dramatists, for whom the political debates were fertile ground for both satire, as seen in the works of Mercy Otis Warren and Colonel Robert Munford, and for plays about heroism, as in the works of Hugh Henry Brackenridge. The postwar period saw the birth of American social comedy in Royall Tyler's The Contrast, which established a much-imitated version of the "Yankee" character, here named "Jonathan". But there were no professional dramatists until William Dunlap, whose work as playwright, translator, manager and theater historian has earned him the title of "Father of American Drama"; in addition to translating the plays of August von Kotzebue and French melodramas, Dunlap wrote plays in a variety of styles, of which André and The Father; or, American Shandyism are his best. The 19th century Prewar theater At 825 Walnut Street in Philadelphia, Pennsylvania, is the Walnut Street Theatre, or, "The Walnut." Founded in 1809 by the Circus of Pepin and Breschard, "The Walnut" is the oldest theater in America. The Walnut's first theatrical production, The Rivals, was staged in 1812. In attendance were President Thomas Jefferson and the Marquis de Lafayette. Provincial theaters frequently lacked heat and minimal theatrical property ("props") and scenery. Apace with the country's westward expansion, some entrepreneurs operated floating theaters on barges or riverboats that would travel from town to town. A large town could afford a long "run"—or period of