
JAPAN'S INTERNATIONAL RELATIONS 397
nance of the Northern Sung (960-1127) and vigorously promoted
foreign trade in hopes of resolving its
financial
crisis.
Japan did not have official diplomatic relations with either the South-
ern Sung or the Koryo (918-1391) dynasties. But it did enjoy close
cultural and economic ties with both China and Korea, especially the
Southern Sung dynasty, through its commercial maritime activity
along the China seacoast which formed one link in the East Asian
trading sphere. This was the reason that the Mongols - who had domi-
nated Koryo in creating a new international order in East Asia after
their conquest of Southern Sung - tried first to entice Japan into the
new order and then to conquer it. Thus, the Mongol invasions were
attempts to force Japan to enter international politics.
The Kamakura bakufu assumed diplomatic powers during the inva-
sions and undertook official trade with the Yiian dynasty of China
(1279-1368) in response to the Mongol's official intensification of its
trade policy during the late Kamakura period. This presaged the diplo-
macy of the succeeding Muromachi bakufu which received investiture
from China's Ming dynasty (1368-1644) and was included in the
Sinocentric international order. The Mongol invasions strengthened
the authoritarian tendencies of the Hojo family, which held the real
power in the Kamakura bakufu, and presented the Hojo with a num-
ber of problems beyond their administrative capabilities, finally caus-
ing the bakufu to topple in 1333.
The Kemmu regime, which destroyed the Kamakura bakufu and
lasted only two years, led Japan into the protracted internal conflict
between the Northern and Southern Courts during the Nambokucho
period (1333-92). During this sixty-year period Ashikaga Takauji
founded the Muromachi bakufu. The war between the courts during
the fourteenth century served to consolidate the power of the
Muromachi bakufu. During this struggle in 1350, the attacks of Japa-
nese pirates
(wako)
began in earnest, spreading from the Korean penin-
sula south along the China coast.
2
The wako's activities spanned four
centuries and occurred in two phases.
The early phase of
wako
activity began in the thirteenth century and
extended to the second half of the fourteenth, corresponding to the
Nambokucho and early Muromachi periods in Japan, the late Koryo
2 There are many works dealing with the wako, and a number of works on Koryo, Choson, and
Ming relations with Japan also touch on the wako. See especially Tanaka Takeo, Chusei kaigai
koshoshi
no kenkyu (Tokyo: Tokyo daigaku shuppankai, 1959) and Wako to kango boeki (Tokyo:
Shibundo, 1961); Kobata Atsushi, "Kango boeki to wako," in Iwanami koza Nihon rekishi,
vol.
7 (chusei 3) (Tokyo: Iwanami shoten, 1963); and Ishihara Michihiro, Wako (Tokyo:
Yoshikawa kobunkan, 1964).
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