Dōgen Zenji (道元禅師; 19 January 1200 – 22 September 1253), also known as Dōgen Kigen (道元希玄), Eihei Dōgen (永平道元), Kōso Jōyō Daishi (高祖承陽大師), or Busshō Dentō Kokushi (仏性伝東国師), was a Japanese Buddhist priest, writer, poet, philosopher, and founder of the Sōtō school of Zen in Japan. Originally ordained as a monk in the Tendai School in Kyoto, he was ultimately dissatisfied with its teaching and traveled to China to seek out what he believed to be a more authentic Buddhism. He remained there for five years, finally training under Tiantong Rujing, an eminent teacher of the Chinese Caodong lineage.