Final answer:
Beethoven's Moonlight Sonata was dedicated to Countess Giulietta Guicciardi, with whom he had a romantic connection.
Step-by-step explanation:
Ludwig van Beethoven dedicated his Piano Sonata in C-sharp Minor, Op. 27, No. 2, commonly known as the Moonlight Sonata, to Countess Giulietta Guicciardi. Beethoven was reportedly in love with the countess at the time he composed the sonata. Despite the romantic connection, their relationship did not become a lasting one, largely due to the disparities in their social standings.