The present Chapter1 gives a concise account of the Armenian historio-graphical sources (5th-13th centuries) that refer to Caucasian Albania, its people and its religious and administrative setting. As the primary source on Caucasian Albania and its inhabitants, it deals with the History of the Country of the Albanians, attributed to a certain Movses Kalankatuatsi or Daskhurantsi, which was written in Armenian between the 7th and 10th centuries on the basis of a wide variety of sources, both older Armenian accounts and local, presumably also oral, traditions that are otherwise unattested. We first summarise the information given by the Armenian historiographers of the 5th-8th centuries that may have served as sources for the History and then provide an overview of how the History itself has left its traces in the Armenian historiography of the subsequent times (up to the end of the 13th century). To illustrate this, we compare the narratives about the three most saliant figures relating to the time of the Christianisation of Albania, viz. St Elisaeus, St Grigoris and King Urnayr, thus establishing the coexistence of two versions of the respective legends in the History, their provenance and their later exploitation.