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>I am looking for information on the second marriage of Theodor von Ungern-Sternberg (1857-1918), a Baltic german Baron living in Estonia - the name of his wife, the children from this marriage etc. The marriage would have taken place in the 1890s.
>Can anyone help? Any information would be much appreciated.
You'll probably get (better) results by asking your question in the Usenet newsgroup called alt.talk.royalty Have you heard of it?
Alternatively, you can look up this family in the German-language series of royalty and nobility genealogical books known as GHdA (Genealogisches Handbuch des Adels). See FA X 1977 (F=Freiherrliches; A=A part (then there's the B part); X=volume published to date for the F (Baronial) nobles; 1977= year published). You'll find the GHdA (comparable to the old Almanach de Gotha) in larger public libraries or in univ. or research libraries. I don't have this particular volume at home, but I'll bet dollars to donuts that someone in a.t.r. does, or at least can access one for you.
Best of luck.