Greek monks played a direct role in the upper hierarchy of Buddhism, and in its early dissemination. During the rule (165–135 BC) of the Greco-Bactrian King Menander I (Pali: "Milinda"), Mahadharmaraksita (literally translated as 'Great Teacher/Preserver of the Dharma') was "a Greek (Pali: Yona, lit. Ionian) Buddhist head monk," according to the Mahavamsa (Chap. XXIX), who led 30,000 Buddhist monks from "the Greek city of Alasandra" (Alexandria of the Caucasus, around 150 km north of today's Kabul in Afghanistan), to Sri Lanka for the dedication of the Great Stupa in Anuradhapura. Dharmaraksita (Sanskrit), or Dhammarakkhita (Pali) (translation: "Protected by the Dharma"), was one of the missionaries sent by the Mauryan emperor Ashoka to proselytize the Buddhist faith. He is described as being a Greek (Pali: "Yona", lit. "Ionian") in the Mahavamsa, and his activities are indicative of the strength of the Hellenistic Greek involvement during the formative centuries of Buddhism. Indeed, Menander I was famously converted to Buddhism by Nagasena, who was a student of the Greek Buddhist monk Dharmaraksita. Menander is said to have reached enlightenment as an arhat under Nagasena's guidance and is recorded as a great patron of Buddhism. The dialogue of the Greek King Menander I (Pali "Milinda") with the monk Nagasena comprises the Pali Buddhist work known as the Milinda Panha.