Beethoven Writes His Letter To the "Immortal Beloved"

It is likely that Beethoven was at Teplitz when he wrote three love letters to an "Immortal Beloved". While the identity of the intended recipient is an ongoing subject of debate, the most likely candidate, according to what is known about people's movements and the contents of the letters, is Antonie Brentano, a married woman with whom he had begun a friendship in 1810.

http://en.wikipedia.org/wiki/Ludwig_van_Beethoven