Bronze Age. Petroglyphs attributed to that period suggest that their creators were hunters on the steppes of central Asia, living between Kazakhstan and China. It is suspected that an Indo-European population known as the Mon might then have lived in this region, before mixing with or being replaced by the next settlers, the Dards. Early Buddhism coming from Kashmir spread its influence in Zanskar, possibly as early as 200 BC. The earliest monuments date from the Kushan period. After this eastward propagation of Buddhism, Zanskar and large parts of the Western Himalaya were overrun in the 7th century by the Tibetans, who imposed their then animistic Bön religion. Buddhism regained its influence over Zanskar in the 8th century when Tibet was also converted to this religion. Between the 10th and 11th centuries, two Royal Houses were founded in Zanskar, and the monasteries of Karsha and Phugtal (see picture) were built. Until the 15th century Zanskar existed as a more or less independent Buddhist Kingdom ruled by two to four related royal families. Since the 15th century, Zanskar has been subordinate to Ladakh, sharing its fortunes and misfortunes. In 1822 a coalition of Kulu, Lahoul, and Kinnaur invaded Zanskar, plundering the country and destroying the royal palace at Padum. In the mid-20th century, border conflicts between India, Pakistan and China caused Ladakh and Zanskar to be closed to foreigners. During these wars Ladakh lost two thirds of its original territory, losing Baltistan to Pakistan and the Aksai Chin to China. Ladakh and Zanskar, despite a tumultuous history of internal wars and external aggressions, have never lost their cultural and religious heritage since the 8th century. Thanks to its adherence to the Indian Union, this is also one of the rare regions in the Himalaya where traditional Tibetan culture, society, and buildings survived the Chinese Cultural Revolution. In the last twenty years, the opening of a road and the massive influx of tourists and researchers have brought many changes to the traditional social organisation of Zanskar. In 2007 the valley suffered its third year of a desert locust infestation with many villages losing their crops. The response of the monasteries puja (prayer) to get rid of them, while the government advocated insecticides, which the Buddhists were reluctant to use, but in some cases were forced to try, with as yet undocumented success. In 2008 it was reported that the locusts had left