The circus is an organization of circus performance.It originated in ancient Roman gladiator arenas and was of cruelty and blood.At that time,there was a saying of "only bread and the circus" can please the romans.The "circus" derives from latin,it refers to the round unroofed amphitheaters.The modern circus is also in round fields,so it is called "the circus".
The circus we are aware of now came in the year of 1768.Philip Astleyhilip,a acrobatics rider,established "Astleyhilip Riding School of England" in London.He was the first one discovered the secret of acrobatics riding；that if he stand on the horse back and his horse takes a round circle gallop,the centrifugal force can help him maintain balance.