Thirteen months later a coup d’état placed the tsarevna Elizabeth on the throne (December 6, 1741), and Ivan and his family were imprisoned in the fortress of Dunamunde (Ust Dvinsk) (December 13, 1742) after a preliminary detention at Riga, from whence the new empress had at first decided to send them home to Brunswick. In June 1744 they transferred to Kholmogory on the White Sea, where Ivan, isolated from his family, and seeing nobody but his gaoler, remained for the next twelve years. Rumours of his confinement at Kholmogory having leaked out, he was secretly transferred to the fortress of Schlusselburg (1756), where he was still more rigorously guarded, the very commandant of the fortress not knowing the identity of "a certain arrestant".
On the accession of Peter III (1762) the condition of the unfortunate prisoner seemed about to improve, for the kind-hearted emperor visited and sympathised with him; but Peter himself lost power a few weeks later. In the instructions sent to Ivan’s guardian, Prince Churmtyev, the latter received orders to chain up his charge, and even to scourge him should he become refractory.
On the accession of Catherine II (summer 1762) still more stringent orders were sent to the officer in charge of "the nameless one". If any attempt were made from outside to release him, the prisoner was to be put to death; in no circumstances was he to be delivered alive into anyone’s hands, even if his deliverers produced the empress’s own sign manual authorising his release. By this time, twenty years of solitary confinement had disturbed Ivan’s mental equilibrium, though he does not seem to have been actually insane. Nevertheless, despite the mystery surrounding him, he was well aware of his imperial origin, and always called himself gosudar (sovereign). Though instructions had been given to keep him ignorant, he had been taught his letters and could read his Bible. Nor could his residence at Schlusselburg remain concealed for ever, and its discovery was the cause of his ruin. A sub-lieutenant of the garrison, Vasily Mirovich, found out about him, and formed a plan for freeing and proclaiming him emperor. At midnight on 5 July 1764, Mirovich won over some of the garrison, arrested the commandant, Berednikov, and demanded the delivery of Ivan, whom his gaolers murdered there and then, in obedience to the secret instructions already in their possession.
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