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Johanna Maria Louise Loisinger (1865–1951), was an Austrian actress, pianist, and soprano opera singer, She was born on 18 April 1865 in Preßburg, Austria (today Bratislava), the daughter of John Loisinger and Maria Meier.
Loisinger married Prince Alexander of Battenberg (1857–1893) on 6 February 1889 in Menton, Alpes-Maritimes, France. The prince had resigned from the Bulgarian throne in 1886 and had assumed the style of Count von Hartenau, so Loisinger became the Countess von Hartenau. The couple settled in Graz, Austria, and had two children, Assen Ludwig Alexander (1890–1965) and Marie Therese Vera Zvetana (1893–1935). After her husband's early death, she moved to Vienna, where she was an active patron of musical organisations. Among other posts, she was president of the Vienna Symphony.
- "Johanna Loisinger, wife of Prince Alexander of Bulgaria". Unofficialroyalty.com. Retrieved 16 August 2016.
- "Family of Johanna Maria Louise Loisinger and Alexander the I Joseph, Count of Hartenau, Prince of Hessen-Darmstadt, Prince of Bulgaria (Hesse - Battenberg)". Nobelcircles.com. Retrieved 16 August 2016.
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