In the early 17th century, Japan was unified by the shōgun Tokugawa Ieyasu. After his death, Tōshō-gū shrine was built in Nikkō on what the shōguns thought of as holy ground to protect and worship Ieyasu. The establishment of the Nikkō Tōshō-gū in 1617 brought Nikkō to national attention. The Tokugawa shogunate developed the Nikkō Kaidō (日光街道, part of the major road connecting Nikkō with Edo) and required lavish processions to worship Ieyasu, the founder of the Tokugawa line of shōguns.