Armenian (Armenian literature) folk epic dealing with the adventures of the Christian king David of Sasun in his defense against infidel invaders from Egypt and Persia. The epic was based on oral tradition that presumably dates from the 8th to the 10th century; it was widely known from the 16th through the 19th century and was finally written down in 1873. It is composed in poetic lines of irregular length arranged into rhyme groups. Although King David lacks the dignity and heroic stature of more primitive epic heroes, he is full of life and energy, and his human failings add to his charm. The appeal of the epic is enhanced by the devils and spirits that figure prominently in the numerous incidents and situations involving David and his son Mher the Younger.