Furthermore, Indian urban culture was left in decline, and Buddhism, gravely weakened by the destruction of monasteries and the killing of monks by the hand of the vehemently anti-Buddhist Shaivist Mihirakula, started to collapse. Great centres of learning were destroyed, such as the city of Taxila, bringing cultural regression. During their rule of 60 years, the Alchons are said to have altered the hierarchy of ruling families and the Indian caste system. For example, the Hunas are often said to have become the precursors of the Rajputs.