Fukuoka Domain

 was a Japanese domain of the Edo period. It was associated with Chikuzen Province in modern-day Fukuoka Prefecture on the island of Kyushu. The domain was also sometimes referred to as Chikuzen Domain, or as Kuroda Domain, after the ruling Kuroda family.
In the han system, Fukuoka was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields. In other words, the domain was defined in terms of "kokudaka", not land area. This was different from the feudalism of the West. With its rating of 473,000 koku, the domain was the fifth-largest in Japan, excluding the domains held by the Tokugawa-Matsudaira dynasty.
List of "daimyōs".
The hereditary "daimyōs" were head of the clan and head of the domain.
 Kuroda clan, 1600–1868 ("tozama"; 502,000→412,000→433,000→473,000 "koku")
Family tree.
As Tsugutaka, the sixth "daimyō", was without heirs, he adopted an heir from a branch of the Tokugawa family to continue the line: