The theory of the three Sangams establishes that these were successive and not contemporary. The traditional accounts of Iraiyanar Ahapporul mention that there were three Sangams (I, II and III) held, which flourished for 9990 years at frequent intervals. These were attended by 8598 scholars. Sage Agastyar was the founding father. The Ahapporul commentary also mentions about their successive order and the deluges occurring during the intervals between them. These Sangams or academies were patronized by 197 Pandyan kings. According to the tradition, of the three successive Sangams, the first two belong to prehistory. All the three were held in the capital of the Pandyas. As the capital was shifted from time to time, old Madurai was the headquarters of the first Sangam, and the second academy was held at Kapatapuram. Both these centres were washed away by the sea during successive deluges. The third Sangam was located in modern Madurai.
The date of the third Sangam can be established with more probability than the other Sangams. This date is taken to be the first two centuries of the Christian era and probably the century immediately preceding the Christian era. The age of Tolkappiar is believed to be in the second Sangam era and the third Sangam era coincides with the Indo-Roman trade with the contemporary Imperial Rome. This dating is based on the evidence available in the accounts of the Greek writers of the time. There are several references to the overseas trading activities between the Mediterranean world and Tamil region. The same is also attested by the Sangam literature.Thus, the third Sangam witnessed the production of numerous extant works. The Sangams can be compared to the French Academy in Europe in modern times, which aimed at maintaining the purity of the language and literary standards.