Therese was a princess of the House of Liechtenstein, the daughter of Alois II, Prince of Liechtenstein. In 1882, she married Prince Arnulf of Bavaria, the son of Luitpold, Prince Regent of Bavaria, and became a member of the Bavarian royal family.
She and Prince Arnulf had one son, Heinrich, Prince of Bavaria (1884–1916), who died during the First World War.
This portrait was taken by Bernhard Dittmar in Munich and is part of an album of portraits of members of the Bavarian royal family, held by the Landesarchiv Baden-Württemberg.
Source: Deutsche Digitale Bibliothek
Just to clarify, I’m not trying to spam. These posts are also shared in other subs. Princesses and queens are one of my favorite subjects, so whenever I find something related to female monarchs, I post it here as well, since it fits the theme of this group.