![](https://assets12.geni.com/images/external/twitter_bird_small.gif?1715966404)
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http://genealogics.org/getperson.php?personID=I00389831&tree=LEO
Deutschland, Russland und das Baltikum at Google books, by Florian Anton and Leonid Luks.
https://personen.digitale-sammlungen.de//baltlex/Blatt_bsb00000600,... ad. I
Source:
Alvericus page 35; GHBR Estland I, page 391, 396; GHdA 27, Freiherren A IV, page 383.
http://personendatenbank.germania-sacra.de/index/gnd/11864761X
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