Entsuin Temple is a historic temple that belongs to the Myoshinji school of the Rinzai sect of Buddhism. It is the 1st Holy Place of 33 Kannon Pilgrimage in Sanriku. Located in Matsushima, one of Japan’s Three Finest Views, the temple is popularly called “Rose Temple” or “Moss Temple.”

In the precinct is Otamaya (the mausoleum) named Sankeiden, where Date Mitsumune, a grandson of Date Masamune, is buried. Constructed in 1647, it is the oldest mausoleum structure in the precinct. It is a square building with a pyramid-styled tiled roof. The railing is built around the building. It is one of the few 3-bay square mausoleums in the Tohoku region.

Inside the mausoleum is Zushi (a miniature Buddhist shrine) housing the statue of Mitsumune on the horse. The painted decoration given on Zushi is very gorgeous. Interestingly, some Western-styled patterns influenced by the Kirishitan (Christianity) culture can be seen among the decorations.

The mausoleum had been closed to the public for 350 years. However, it was open to the public since it was designated as an Important Cultural Property by the national government.