Question: why was zhongar dzong built?
Answer: Zhongar Zhong Oral account believes that a king named Karpo Dung who invited a famous architect from Paro by the name of Zochhen Bala to design and built the fortress commissioned the Dzong. ... Fearing that Bala would build a better Dzong in future decided to but off Bala's hands during the farewell ceremony.