The druk (also known as a "duk" or "dug") was adopted as an emblem by the Dugpa sect, which originated in Tibet and spread to Bhutan. According to traditional accounts, when the sect's founder, the Lama Chodje Tsangpa Gyarespa, began to build the Ralung monastery, there was a violent storm. Thunder, or the "Cloud-Voice," is seen as the roar of the dragon. Deciding that this was an omen, he named the monastery Dug-Ralung, adding the word "thunder dragon" to the name. The disciples at the monastery were known as Dugpa, or "Those of the Thunder." As of 1900s, the Grand Lama of Bhutan wore a hat with thunder dragons on it to signify the origins of the sect. As the sect became more popular, it set up monasteries in what is now Bhutan, with the result that the area became known as Dug Yul, or Land of Thunder, among both Tibetans and Bhutanese.