Ostwick

Kaer Ostwick (Auveregne: Ouest-Château) is a castle located on the border of the Kingdom of Lotharingia, once owned by House Horen-Vimmark. The heir to Ostwick, Arthur Horen-Vimmark, offered the castle to Tobias Staunton to use in the Coalition War, which became the rebellion's central base. After the rebellion's conclusion, the keep was given over to the general and mercenary Jacques de Felsen.

After Jacque's return to Courland, the large fortress was left in severe disrepair and disarray. The Crown of Lotharingia reposed the castle in 1604, granting it as a fief to Princess Anna Sophia of Pruvia.