10th-12th century

The systematized sects became prosperous through the support of local lords, often kingsmen of the founding lama, and, except for the Kadampa, each developed its own system of keeping the hierarchical succession within a noble family. 
Although lamas of different schools studied amicably together, their supporters inevitably indulged in worl dly competition. This tendency was soon to be intensified by the intervention of a new Asian power, the Mongols.