<human>:  When was the Potala Palace, Lhasa built?
<bot>: The Potala Palace was built in the 7th century. It was built to be the residence of the Dalai Lamas, the spiritual and temporal leaders of Tibet. The Dalai Lamas were the highest ranking religious and political leaders of Tibet. The palace was constructed in the Tibetan style of architecture, which is characterized by a large central hall with many smaller rooms surrounding it.