The Mūlasarvāstivāda was one of the early Buddhist schools of India. The origins of the Mūlasarvāstivāda school and their relationship to the Sarvāstivāda remain largely unknown, although various theories exist.
Tibetan Buddhist bhikṣus of the Mūlasarvāstivāda ordination lineage
The Sarvāstivāda was one of the early Buddhist schools established around the reign of Ashoka. It was particularly known as an Abhidharma tradition, with a unique set of seven canonical Abhidharma texts.
Seated Buddha from the Sarvāstivādin monastery of Tapa Shotor, 2nd century CE
Copper-plate inscription mentioning the Sarvastivadas, in the year 134 of the Azes era, i.e. 84 CE, Kalawan, Taxila
A Kushan era votive stupa from Mohra Muradu, Taxila, where Sarvāstivāda groups are known to have lived by the end of the first century BCE
The Dharmarajika Stupa and monastery ruins, a major Buddhist site in Taxila, one of the capitals of the Kushan empire