They visited Beethoven and got him to give the girls piano lessons. The Maestro taught them for 16 days and recorded the score of the poem ‘I Think about You’ in the memorial album of the two Brunsvick Countesses.

Later in August 1806, he finished the Op. 57 Appassionata in Martonvásár, and dedicated it to Ferenc, just as the Fantasia for Piano Op. 77 in 1809. Ferenc Brunszvik had good relations in theatre circles, so he was probably the one to get Beethoven to compose music for Kotzebue’s pieces: King Stephen and Ruins of Athens, which Beethoven dedicated to the Hungarians. On 9 February 1812, at the opening ceremony of the German Theatre in Pest, the performance of the two pieces was a sweeping success. Their relationship remained close until the Maestro’s death.

From the outset, Beethoven gave special attention to Josephine. But the younger Brunswick girl married to Count Joseph Deym in 1800. She lived in Vienna most of the time, and Beethoven was a frequent guest in their salon. In 1804, Josephine became widowed with four children then in 1810 she married to the Estonian Baron Kristóf Stackelberg. The news of their marriage made Beethoven mournful. Josephine had a sad fate, even though she gave birth to three daughters in her new marriage, her husband left her and she died at the age of 42 due to nervous fever.

The third girl, Caroline also knew Beethoven, but she married to Count Imre Teleki at a very young age and lived the rest of her life in Hosszúfalva. Her first-born daughter, Blanka founded the first Hungarian boarding school for girls. After the fall of the 1848-49 Revolution and the War of Independence, the imperial court sentenced her to a 10-year imprisonment in a castle because of hiding outlaws and issuing ‘rebellious articles’. After years in Kufstein, she was taken to the fortress prison in Laibach, from where she was released with amnesty in 1857. She no longer returned to Hungary and died in Paris, and was buried there.

Although she was not called Brunszvik, Giulietta Guicciardi was a member of the family due to her mother, Susanna Brunszvik. Giulietta’s memory is preserved by the dedication of the piano sonata Op. 27 No. 2, better known as the ‘Moonlight Sonata’.

After Beethoven's death, a three-part letter without an addressee or date was found a hidden drawer, known as ‘the letter to the Immortal Beloved’. According to the results of research over the past 30 years, it was likely to be written by Beethoven to Josephine.