The history of Shinagawa is inextricably linked with the rise of the city of Edo, now known as Tokyo. Although the first mentions of this area date back to the 12th century, its true flourishing began in the Edo period (1603–1868). At this time, Shinagawa acquired strategic importance as the first post station (known in Japanese as a "shukuba") on the famous Tokaido road, which connected the Shogunate capital of Edo with the Imperial city of Kyoto. This status defined its development for centuries to come.
A key factor in the establishment of Shinagawa was its unique geographical and political position. Located by Tokyo Bay, it served as both a land and sea gateway to the capital of Japan. The name "Shinagawa," which translates as "Goods River," points to its early role in trade—ships carrying goods for the growing city arrived here. As the first checkpoint on the way to Edo, Shinagawa was a place where all travelers were strictly inspected, particularly for weapons, to prevent potential uprisings against the Shogun's authority.
Thanks to its status as a vital transport hub, an economy focused on serving travelers thrived in Shinagawa. It was home to many inns, teahouses, and entertainment establishments where both ordinary travelers and processions of noble feudal lords (daimyo) heading to Edo would stay. This historical character is preserved today: the area around Shinagawa Station remains one of Tokyo’s largest in terms of the number of hotels, making it the modern heir to the ancient post town.