The Theravāda school is ultimately derived from the Vibhajjavāda (or 'doctrine of analysis') grouping which was a continuation of the older Sthavira (or 'teaching of the Elders') group at the time of the Third Buddhist Council around 250 BC, during the reign of Emperor Asoka in India. Vibhajjavadins saw themselves as the continuation of orthodox Sthaviras and after the Third Council continued to refer to their school as the Sthaviras/Theras ('The Elders'), their doctrines were probably similar to the older Sthaviras but were not completely identical. After the Third Council geographical distance led to the Vibhajjavādins gradually evolving into four groups: the Mahīśāsaka, Kāśyapīya, Dharmaguptaka and the Tāmraparnīya. The Theravada is descended from the Tāmraparnīya, which means 'the Sri