Cities and towns in Tibet are basically centered on monasteries. Lhasa, Xigaze and Qamdo, for example,came into being after monasteries were established on the spot.Lhasa was built based on Jokhang Monastery and the Potala Palace; Xigaze developed from the well known Tashilhungpo Monastery and Qamdo in relation to Qambaling Monastery. A large number of monks living in monasteries needed daily sustenance, so that lay people to serve them began to gather and gradually settle down. Merchants came, too, thereby forming cities. Zada was among them,coming into being with the establishment