has been Ardashir V in the chain of local Shahs. Historiography The primary references of the Sassanian era can be divided to the two categories "text remnants" and "reports": Text remnants Text remnants include inscriptions, leather writings, papyri and crockeries written in multiple languages and scripts. Examples of text remnants related to Ardashir I include his short inscription in Nagsh-e Rajab and also Shapur I's inscription at the Ka'ba-ye Zartosht. Reports Reports are texts that are written in various languages and periods. The basis of the writings of all Muslim historians (Arabic and Persian histories), has been the official Khwaday-Namag of the Sassanian court that have utilized the recorded diaries in the official calendars of the court as references. Khwaday-Namag was prepared at the ends of the Sassanian era in Middle Persian language. The title of the Arabic translation of the book was Seir-ol Moluk-el Ajam and the Persian version was Shahnameh. Today, none of the direct translations of Khwaday-Namag or its original Persian text are available. Greek-Roman Cassius Dio is one of the famous resources of Parthian history that has given a report about the downfall of the Parthians and the rise of Ardashir I. Herodian's History has also extensively explained the procedure of the change of monarchy from Parthian to Sassanian. Although Agathias lived during the time of Khosrow I, due to his access to the royal yearbooks in Ctesiphon archives, his history book is one of the main sources. However, he has used colloquial statements in reporting the story of Ardashir's youth. Armenian The Armenian history in the Sassanian era is completely connected with Iranian royal history; thus, not only do the writings of then Armenian historians provide important matters about the adventures of Iranian kings of kings, but show the status of Iran-Armenia relations. Armenian History by Agathangelos is one of Armenian resources about the early Sassanian era. Movses Khorenatsi, known as the Armenian Herodotus, a famous historian of the fifth century A.D, has stated a story about Ardashir I that is relatively similar to the adapted story from the biography of Cyrus the Great. Syriac Another class of Sasanian history references is the books written by Christians in Syriac language. Arbella's Chronicles is a text written in mid-sixth century AD and includes the history of Christian regions of Mesopotamia from the second century until 550. The book is very valuable for the period of the