In the Edo period this area was called the Saga Domain (佐賀藩 "Saga-han"), and it included three sub-domains: the Hasunoike, Ogi and Kashima Domains. Also within the current borders of Saga Prefecture during this time were the Karatsu Domain (唐津藩 "Karatsu-han") and two territories of the Tsushima-Fuchū Domain (対馬府中藩 "Tsushimafuchū-han"). Saga Domain and its sub-domains continued to be ruled by the Nabeshima clan, its various illegitimate family lineages and members of the former Ryūzōji clan, and politically the area was relatively stable. However, the cost of defending Nagasaki was increasing and, difficult from the start, the financial situation was worsened by the great Kyōhō famine and the Siebold Typhoon of 1828. Nevertheless, due to the large area of reclaimed land from the Ariake Sea arable land was able to increase significantly and by the 1840s the annual koku of Saga Domain increased to about 670,000, twice that of 200 years before.