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Styrell was born daughter of a baker in Stockholm and became an actress at the age of seventeen, when she performed in the inauguration of the Odéon Theatre in 1859 under the name Hanna Stjernblad.
She suddenly appeared as the hostess on the King's country estate Bellevue in the summer of 1860. At the opening of parliament in 1862, a paper raported: Among the public people, who was present at the act, a certain miss - blad was noticed, escorted by two uniformed butlers to the event. The "miss -blad" was Hanna, who used the name Stejrnblad. As a royal mistress, she often lived on the estate Väntorp, a short distance from the royal Ulriksdal Palace. Väntorp was given to her in 1866, when she had become quite wealthy; she is listed with a fortune at that year. Her relationship with Charles continued until Charles death in 1872. They went to Spa, separately, during his sickness the last year of his life. She had one daughter with Charles; Ellen Maria (b. 1865), who was taken care of by her own halfsister, Theresia. Theresia's husband was later made royal wallpaper master.
In 1876, she married the officer Adolf Tersmeden, who became a baron and a landlord upon his father's death. Hanna made many improvements to the estate, which was appreciated by the employees.
- Germund Michanek: Carl XV och Hanna på Väntorp (Charles XV and Hanna on Väntorp) (Swedish)
- Lars Elgklou (1978). Bernadotte. Historien - eller historier - om en familj.. Stockholm: Askild & Kärnekull Förlag AB