The first evidence of Tang Soo Do, an ancient form of Korean martial arts, appeared during the Three Kingdom era (57 BC-935 AD) as Hwa Rang Do. The indigenous martial arts quietly developed through generations of the Korean people. During some eras it flourished and other times it diminished, according to the political, economic or cultural environment. The art was known by various names throughout the eras as Hwa Rang Do, Moo Sul, Kyuck Too Ki, Soo Bahk Ki, Soo Byuck Ki, and Taek Kyun respectively.