Who was the leading composer of waltzes during Romantic period?

The leading composer of waltzes during the Romantic period was Johann Strauss Jr. (1825-1899), also known as the "Waltz King." Strauss Jr. was an Austrian composer who composed over 500 waltzes, polkas, and other dance music. His most famous waltzes include "The Blue Danube," "Tales from the Vienna Woods," and the "Emperor Waltz." Strauss Jr.'s music was greatly admired by his contemporaries, including Brahms and Wagner, and he was highly influential in the development of the waltz as a musical form.