 Parallel to it in some parts is a "Brief Ecclesiatical Chronicle" first described by Butros Haddad in 1986 and published by him in 2000.The "Chronicle" deals with ecclesiastical, social, and political issues of the Persian Christian church giving a history of its leaders and notable members.It details the growth and prospering of the Nestorian Church despite alternating periods of persecution and toleration under the Zoroastrian rulers of Sassanid Persia.