The Genealogy of Peter III from Goudar's Book of 1763

The most intriguing thing in this document is the mention of Ioann Antonovich, or Emperor Ivan VI, a second cousin once removed of Peter III.

At the time of this book's publication, 1763, Ivan VI, confined in prison, was still alive and living out the last year of his wretched life in captivity. The genealogical table says “dans un Couvente depuis 1744”, that is, “in a convent since 1744”, which is not quite true: although Elizabeth Petrovna did shut up the child Ioann, born in 1740, at Kholmogory in 1744, he was in the monastery only nominally, and was in fact held in the bishop's house, in a prison-like room behind blank walls. From 1756 he was transferred to a solitary cell in the Shlisselburg Fortress, and could only dream of monastic life. Soon after the murder of Peter III, Ivan VI's turn came too: the prisoner emperor, who had reigned for a mere 404 days in infancy, was killed in July 1764, not yet 24 years old.