A number of scholars have identified three distinct major phases of missionary activity seen in the history of Buddhism in Central Asia, which are associated with respectively the Dharmaguptaka, Sarvāstivāda, and the Mūlasarvāstivāda, and the origins of the Sarvāstivāda have also been related to Ashoka sending Majjhantika (Sanskrit: Madhyāntika) on a mission to Gandhara, which had an early presence of the Sarvāstivāda. The Sarvāstivādins in turn are believed to have given rise to the Mūlasarvāstivāda sect, although the relationship between these two groups has not yet been fully determined. According to Prebish, "this episode corresponds well with one Sarvāstivādin tradition stating that Madhyantika converted the city of Kasmir, which seems to have close ties with Gandhara."