During 17th century Bhutan was invaded several times by Tibetan forces seeking to seize a very precious relic, the Ranjung Kharsapani. Zhabdrung Ngawang Namgyal led the Bhutanese to victory over the Tibetans and to commemorate the triumph he introduced the Punakha Drubchen. Since then Punakha Drubchen (also known as Puna Drubchen) became the annual festival of Punakha Dzongkhag.