In contrast Mughal painting was "almost entirely secular", although religious figures were sometimes portrayed. Realism, especially in portraits of both people and animals, became a key aim, far more than in Persian painting, let alone the Indian traditions. There was already a Muslim tradition of miniature painting under the Turko-Afghan Sultanate of Delhi which the Mughals overthrew, and like the Mughals, and the very earliest of Central Asian invaders into the subcontinent, patronized foreign culture. These paintings were painted on loose-leaf paper, and were usually placed between decorated wooden covers. Although the first surviving manuscripts are from Mandu in the years either side of 1500, there were very likely earlier ones which are either lost, or perhaps now attributed to southern Persia, as later manuscripts can be hard to distinguish from these by style alone, and some remain the subject of debate among specialists. By the time of the Mughal invasion, the tradition had abandoned the high viewpoint typical of the Persian style, and adopted a more realistic style for animals and plants.