Hakata-ku (博多区) is a ward of the city of Fukuoka in Fukuoka Prefecture, Japan.

Major military efforts were taken by Kublai Khan of the Yuan dynasty in 1274 and 1281 to conquer the Japanese archipelago after the submission of the Korean kingdom of Goryeo to vassaldom. Ultimately a failure, the invasion attempts are of macro-historical importance because they set a limit on Mongol expansion and rank as nation-defining events in the history of Japan. The invasions are referred to in many works of fiction and are the earliest events for which the word kamikaze is widely used, originating in reference to the two typhoons faced by the Yuan fleets.