His father, Sumiyori, died young at the age of 28, in November 1619, and the Omura domain, which officially had no heir, was in crisis.

However, the chief retainer, Junkatsu Omura[2] He secretly caused her to give birth and persuaded Sumiyori to spare the life of the child, Matsuchiyo.

At this time, Junkatsu was offered a position as a shogun's vassal by the Roju, but he refused and persistently appealed for the continuation of the lord's family.

[3] In the same year, the domain carried out the construction work to rebuild the stone walls of Osaka Castle, which had been ordered at the time of the previous generation, Sumiyori.

Due to illness, he was unable to participate in the Shimabara Rebellion, which occurred at the end of October (December 11, 1637), and Junkatsu led his troops to guard Nagasaki.