I can’t seem to find the Matsura clan on the map, they should be in the Hizen/Hirado area I believe
en.m.wikipedia.org
The Matsura-to, or the Matsuura-to, was a group of
petty military families that had roots in the 11th century in
Hizen Province on the island of
Kyushu. In the 1220s, they were known as pirate bands who sailed to
Korea to "destroy people's dwellings and plunder their property."
[1][2] From the 13th century onwards, they ran
Hirado Domain in Hizen.
[3] By 1371, the Matsura became allied with the
shugo of
Totomi Province,
Imagawa Sadayo, along with the
Shimazu and the
Ouchi clans.
[4] By the 1400s, the group's leadership was mainly made up of petty
barons.
[5] In the 1440s and 1450s, Korea attempted to make peace with the Matsura by issuing them ceremonial copper seals, given to those in maritime affairs that the Koreans had a "favored status" for.
[6]Eventually, the group's leaders became
samurai and
daimyo.
[7]