| Collection | Correspondence of Foreign Royal Families |
| Description | GEO/MAIN/50171-50200 - Extracts from letters of Charlotte Augusta, Princess Royal, Duchess, Electress and later Queen of Württemberg, to Lady Elgin about Princess Charlotte.
GEO/MAIN/51383-51864 - Correspondence of members of the House of Württemberg
GEO/MAIN/51865-51924 - Correspondence of members of the House of Orange and Nassau-Weilburg
GEO/MAIN/51925-51956 - Correspondence of members of the House of Prussia
GEO/MAIN/51957-52288 - Correspondence of members of the House of Brunswick
GEO/MAIN/52289-52411 - Correspondence of members of the House of Denmark
GEO/MAIN/52412-52498 - Correspondence of members of the House of Hesse-Homberg, Hesse-Cassel [-Kassel] and Hesse-Darmstadt
GEO/MAIN/52499-52496 - Correspondence of members of the House of Mecklenburg |