Taiyuin is the mausoleum of Tokugawa Iemitsu, grandson of Tokugawa Ieyasu, the founder of the Tokugawa Shogunate. To honor his grandfather, Iemitsu renovated Toshogu Shrine, the mausoleum of Ieyasu, and had Taiyuin constructed to face Toshogu. Out of respect to Ieyasu, Taiyuin is more modest than Toshogu, yet still magnificent. Taiyuin includes 22 registered National Treasures, and the lavishly decorated prayer hall. Nitenmon Gate and Kokamon Gate exhibit exquisite craftsmanship.