Aizuwakamatsu (会津若松市, Aizuwakamatsu-shi) is a city in Fukushima Prefecture, Japan. As of 1 January 2021[update], the city had an estimated population of 118,159 in 50,365 households,[1] and a population density of 310 persons per km2. The total area of the city was 382.97 square kilometres (147.87 sq mi). The area of present-day Aizuwakamatsu was part of ancient Mutsu Province, and was settled from prehistoric times. The Aizu-Otsuka Kofun within the city borders dates from the 4th century AD, and is an Important Cultural Property. According to legend, in 88 BCE, Emperor Sujin sent two generals; Ohiko and Takenukawa-wake to the Tōhoku region for the purpose of establishing peace after the quashing of a rebellion in the region.[2]