Tangtong Gyalpo: A Guide for Readers Tangtong Gyalpo (1361-1485 CE), or "The King of the Empty Plain," was a Buddhist mahasiddha, physician, blacksmith, architect, and civil engineer. He's also known by the names Chakzampa, the "Iron Bridge Builder," and Tsondru Zangpo, "Excellent Persistence." Many people believe he was an emanation of both Padmasambhava (known as [...]