The Contemplation Sutra of Amitayus (Chinese pinyin: fó shuō guān wú liàng shòu fó jīng, Traditional Chinese: 佛說觀無量壽佛經, Simplified Chinese: 佛说观无量寿佛经, Japanese: 観無量寿経, Kanmuryōju-kyō) , is one of the three major Buddhist sutras found within the Pure Land branch of Mahayana Buddhism. It begins with a story where a prince named Ajatasatru was enticed by the villain Devadatta to murder his father in order to ascend the throne. Ajatasatru killed his father, and nearly killed his mother, Queen Vaidehi, but after advice from his other ministers relented and threw his mother in prison.