What is the reason that the Viennese Waltz is also known as the round dance or court dance?

Vienna Waltz (Viennese Waltz): It is the oldest type of social dance, also known as round dance or court dance, because it has a joyful and free atmosphere, so it is very popular. Vienna Waltz step is not much, most of the rapid alternation of left and right rotary movements, dancing around the dance floor, or join the left and right rotary movements in place, dancers skirt flying, gorgeous and colorful. Because Strauss had written a lot of beautiful dance music for the Vienna Waltz, which made this dance popular throughout Europe. Music: 3/4, about 56 bars per minute. The waltz introduced earlier is the British dancers will be Vienna waltz music slowed down and improved to form the current more popular slow waltz.