qnli question: What was one historic theory of the szlachta origins? sentence: The origins of the szlachta, while ancient, have always been considered obscure.:207 As a result, its members often referred to it as odwieczna (perennial).:207 Two popular historic theories of origin forwarded by its members and earlier historians and chroniclers involved descent from the ancient Iranian tribes known as Sarmatians or from Japheth, one of Noah's sons