In 612, the Empress Suiko had a garden built with an artificial mountain, representing Shumi-Sen, or Mount Sumeru, reputed in Hindu and Buddhist legends to be located at the centre of the world. During the reign of the same Empress, one of her ministers, Soga no Umako, had a garden built at his palace featuring a lake with several small islands, representing the islands of the Eight Immortals famous in Chinese legends and Daoist philosophy. This Palace became the property of the Japanese Emperors, was named "The Palace of the Isles", and was mentioned several times in the "Man'yōshū", the "Collection of Countless Leaves", the oldest known collection of Japanese poetry.