Meanwhile, he stayed a short period in Istanbul in order to found The Istanbul City Theater. Once World War I started he returned to Paris. Between 1915 and 1922, he directed several films under auspices of the "Société cinématographique des auteurs et gens de lettres" ("Film Society of Authors and Men of Letters") of Pierre Decourcelle, adapting literary or dramatic works, such as "La Terre" ("Earth"), "Les Frères corses" ("The Corsican Brothers") and "Quatre-vingt-treize" ("Ninety-three"). He applied the principles of naturalism to film, giving importance to the scenery, natural elements that actually determine the behavior of the protagonists, and by using non-professional actors who were not tied up in the old forms of theater. For Jean Tulard, his literary reputation and is involved in "giving the film its sense of nobility". Influencing film makers like Mercanton, Capellans Hervil and he is "the true father of neorealism". Antoine concluded his career as a theatre and film critic beginning in 1919. For twenty years, his commentary was published by "L'Information", and more sporadically in "Le Journal, Comœdia", and "Le Monde illustré". Two volumes of memoirs were published in 1928, and appeared in the journal "Théâtre" from 1932 to 1933. "(Works as film director)"        Dafydd ab Owain Gwynedd  Dafydd ab Owain Gwynedd ( – 1203) was Prince of Gwynedd from 1170 to 1195. For a time he ruled jointly with his brothers Maelgwn ab Owain Gwynedd and Rhodri ab Owain Gwynedd. Dafydd was the son of Owain Gwynedd by Cristin ferch Goronwy ab Owain (married ). Since Owain and Cristin were first cousins, the marriage was not accepted by the church, which regarded Dafydd as illegitimate. Dafydd first appears on the scene in 1157 when King Henry II of England invaded Gwynedd. Dafydd was involved in the skirmish near Basingwerk in which King Henry was nearly killed. In 1165, he was recorded as having settled in the Vale of Clwyd and as having attacked Tegeingl, gaining much plunder.