I'm also new here, but when I found your threat I decided to enter Alexander Palace for answering your questions. I'm garden historien in Switzerland and I'm researching about the garden of Anna Feodorowna
Anna Feodorowna escaped from Russia 1801 to Coburg, after the murder of Paul I. Her husband Duke Constantin is described as a cruel and sadistic person. So she suffered a long time. Between 1805-1810 she had an affair with Jules Gabriel Emile de Seigneux (he was married with Christiane Friederike von Anhalt and divorced 1805). The first child Eduard seems to be their love-child.
Konstantin wanted to get divorced early (to marry Princess Czertwertinska) but his mother was against it to save the reputation of the Russian Court. So Konstantin travelled to Berne 1818 to visit Anna. Also the Car of Russia travelled anonymous through Switzerland 1814.
1810 Rudolf von Schiferli, Swiss medicine and lord stuart of Anna went to Coburg. They became friends and lovers, so Anna get second child, a daughter called Louise Hilda Agnes. The following yearshe moved with him back to Switzerland. There she bought a mansion, called Elfenau and built a landscape garden during the years between 1814-1825. The plan was created by the royal landskip gardener Joseph Bernand Baumann from Alsace / France, he was connected with Coburg, but I don't know how.
After the death of Schiferli and their daughter at the same year she travelled to Geneva. Any month before death she came "home" to Elfenau, where she died 1860. Her son inherited Elfenau but sold it immetiately.
There are some books about Anna Feodorowna, written in French by Swiss Author Alville (Alix de Watteville). She wrote about her mansion Elfenau, about her Swiss years and about the visitors at Elfenau. You can find it at any library searching tool.
Des cours princières aux demeures helvétiques / Alville 1962
Die Schweizerjahre der Grossfürstin Anna Feodorowna von Russland / Alville 1947 (shortened translation of: )
La vie en Suisse de S.A.I. la grande-duchesse Anna Feodorovna, née princesse de Saxe-Cobourg-Saalfeld / Alville 1943
Don't pay too much for it, you can buy it around 30-50 Swiss Franks at www.ZVAB.com