Malachia Ormanian: Caspian Albania was abolished in the beginning of the nineteenth century

    Theologian, church historian, and philologist Malachia Ormanian (Armenian: Մաղաքիայ Օրմանեան; b. 11 February 1841 – d. 19 November 1918) was the Armenian Patriarch of the Armenian Orthodox Church of Constantinople from 1896 to 1908. In 1908 he was removed due to pressure from the Armenian Assembly and suffered a stroke. Following his rehabilitation, he worked for 2 years in Jerusalem (in the monastery of St. Jacob), where the Patriarch chair was vacant, apparently hoping for the appointment. In November 1917 he was deported to Damascus and by May 1918 moved to Constantinople, where he died a few months later.
    In his book "The Church of Armenia" he writes the following[1]:

The supreme patriarch or catholicos of all the Armenians resides at present at Etchmiadzin, near Erivan, where existed, of old, the original residence, and where, after many wanderings, he has reverted. In those early days he combined in his person two other sees which were accessory to his own: the catholicosate of Georgia, and that of Caspian Albania, which are no longer in existence. The see of Georgia broke away in the seventh century, and that of Caspian Albania was abolished in the beginning of the nineteenth century, on account of the fusion of the Caspio–Albanian or Aghouanian nationality with the Armenian. But, in course of time, circumstances have brought into being other secondary sees. 
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[1] Malachia Ormanian. The Church of Armenia: her history, doctrine, rule, discipline, liturgy, literature, and existing condition. Translated from the French edition with the author's permission by G. Marcar Gregory; With an introduction by the J. E. C. Welldon. London: A. R. Mowbray & Co., 1912, p. 132.