First council was held at Pataliputra by Sthalabahu in the beginning of the third century BC and resulted in the compilation of 12 Angas to replace the lost 14 Purvas.Second Council was held at Valabhi in the 5th century AD under the leadership of Devaradhi Kshamasramana and resulted in final compilation of 12 Angas and 12 Upangas.