was a prominent daimyō (feudal lord) in the western Chūgoku region of Japan during the Sengoku period of the 16th century. The Mōri clan claimed descent from Ōe no Hiromoto, an adviser to Minamoto no Yoritomo. Motonari was called the "Beggar Prince". He was known as a great strategist who began as a small local warlord (jizamurai) of Aki Province and extended his clan's power to nearly all of the Chūgoku region through war, marriage, adoption and assassination.
Sandwiched between the powerful Amago and Ōuchi clans, Motonari led his clan by carefully balancing actions and diplomacy. Eventually, Motonari succeeded in defeating both and controlled the entire Chūgoku region. In his later years, he crushed the Ōtomo clan of Bungo Province in Kyūshū. Motonari ruled from Yoshida-Kōriyama Castle, the clan's main bastion since the early 14th century. His descendants became lords of the Chōshū Domain.
Early life Mōri Motonari was born on April 16, 1497, under the childhood name Shōjumaru (松寿丸) in a small domain of Aki Province. He was the second son of his father, Mōri Hiromoto. His mother was a daughter of Fukubara Hirotoshi, but her name is unknown. His birthplace is said to be Suzuo Castle, the base of the Fukubara clan and his mother's home. Today, there are stone monuments at the ruins of Suzuo Castle to commemorate the birthplace of Motonari at the castle.
In 1500, his father was involved in a power dispute with the Ashikaga shogunate and the Ōuchi clan and decided to retire. He handed over the head position of the clan to his eldest son, Mōri Okimoto and moved to Tajihi-Sarugake Castle with his son Shōjumaru. Okimoto then took over Yoshida-Kōriyama Castle, the main stronghold of the clan.
History remembers the young Mōri Shōjumaru as a fearless daredevil. It is said he escaped by night with some other children from his father's castle and met lord Amago Tsunehisa and his troops. Shōjumaru thought they were the ghosts of the Heike clan samurai, and so tried to become famous with a ghost hunt, a practice favored for the education of the youth of buke families. And so, Shōjumaru came openly to challenge the mounted warrior who looked to him like the general of the troops. It was Tsunehisa. The other children were trembling in fear, but not Shōjumaru. The young lord shot an arrow at the veteran lord. Tsunehisa swiftly caught it with his bare hand. Impressed by the bravery of his young opponent, Tsunehisa spared the boys, looking forward to battle against an adult Motonari.
The following year in 1501 his mother died and in 1506 his father died due to alcohol poisoning. Shōjumaru stayed at Tajihi-Sarugake Castle but his vassal Inoue Motomori (井上元盛) began embezzling land and was turned out of the castle. Because he was now both impoverished and from a powerful family he was called the "Beggar Prince" (乞食若殿) by the common people. The young Shōjumaru was raised by a foster mother Sugi no Ōkata (杉大方), who was a great influence on him; they grew very close. She got him in the habit facing the sun and saying a Buddhist prayer every morning.
In 1511, Shōjumaru officially became an adult and had his genpuku ceremony. He received the name Mōri Motonari (毛利元就).
In 1516, his brother Okimoto died suddenly like their father due to alcohol poisoning. Okimoto's infant son, Kōmatsumaru (幸松丸) succeeded as head of the clan and Motonari became his regent.
After the sudden deaths of his father and brother the Mōri clan was left weak and vulnerable. The most powerful lord of the region, Takeda Motoshige (武田元繁) of Satoukanayama Castle (佐東銀山城), took advantage of the situation and gathered an army of 5,000 and in October, 1517 advanced into the territory of the Mōri's Kikkawa clan allies surrounding Arita Castle (有田城). A few weeks later, Motoshige dispatched a raid into the Mōri clan's territory and set fire to houses in Tajihi (多治比). Motonari went in place of his nephew Kōmatsumaru to relieve Arita Castle from the advancing Takeda forces. This was Motonari's first battle that would decide the fate of the Mōri clan and would become known as the Battle of Arita-Nakaide.
Battle of Arita-Nakaide
With most of the Ōuchi clan forces preoccupied in Kyoto with Ōuchi Yoshioki, the Mōri were unable to call on them for assistance, and Motonari instead mobilized his clan and called on their supporters. Motonari was also aided by his younger brother, Aiō Mototsuna. In total the Mōri strength comprised around 850 men, reinforced by 300 from the Kikkawa clan, for a total of around 1,000. This force marched towards Arita Castle and on the way encountered the Takeda vanguard, commanded by Kumagai Motonao (熊谷元直), commanding about 500 men.Aki-Takeda family historical background (Hiroshima City Culture Foundation The Mōri and their allies stood off and engaged the Takeda with archery fire. Kumagai Motonao was in the front ranks and was encouraging his men when he was struck and killed by an arrow. Takeda Motoshige was meanwhile with the main army at Arita Castle. Learning of Motonao's demise, he drew up his forces and marched to engage the smaller Mōri resistance. The Takeda encountered the Mōri and Kikkawa occupying the opposite bank of the Uchikawa River (又打川) and a bitter struggle ensued. Heavily outnumbered, the Mōri-led forces began to falter and fall back, rallying only when Motonari pleaded with them to stand their ground. Takeda Motoshige himself advanced across the river on horseback but was struck by an arrow and killed. The Takeda broke and retreated, leaving Mōri Motonari the victor. The battle was the start of the decline of the Aki-Takeda clan and the start of the military expansion of the Mōri. Mōri Motonari's name finally became known in the country.
Service under Amago clan In 1518 Amago Tsunehisa made a series of raids into the Ōuchi clan's lands, falling back with the return of Ōuchi Yoshioki from Kyōto. In 1521 a formal peace treaty was signed between the two clans but it lasted but one year. Also sometime around 1522, Motonari married the daughter of Kikkawa Kunitsune (吉川国経) the lord of Ogurayama Castle; this match would not only secure the friendship of the Kikkawa clan but would in time produce three fine sons. This was an important alliance as the Kikkawa were powerful in Aki Province and their land lay directly to the north of Yoshida, the Mōri heartland on the border with Iwami Province. Motonari had thus already extended his influence north in the direction of the silver-rich Iwami Ginzan Silver Mine and south towards the Inland Sea.
In 1522, Tsunehisa marched into Aki Province, forcing Motonari, whose lands sat directly in the Amago's path, to submit. Motonari was immediately dispatched against Kagamiyama Castle (鏡山城) while Tsunehisa himself struck at Kanayama Castle (金山城). Tsunehisa made no progress against Kanayama and retreated, but Motonari was eventually successful at the Battle of Kagamiyama Castle (鏡山城の戦) in 1523. Motonari had problems taking the castle because the lord of Kagamiyama Castle, Kurata Fusanobu (蔵田房信), put up a strong fight, so Motonari persuaded his uncle Kurata Naonobu (蔵田直信) to betray the castle. After the battle Motonari tried to save Naonobu but Amago Tsunehisa executed him for his shameful and disloyal act. It may be that Tsunehisa became aware of Motonari's talent and wary of his expansion, for from then on a rift would grow between Tsunehisa and Motonari.
Early Rise
Leadership of the Mōri clan In July 1523, Motonari's nephew Kōmatsumaru, the titular head of the clan, died suddenly at the age of nine. The senior Mōri vassals met and decided to offer the leadership to Motonari and on August 10 he entered Yoshida-Kōriyama Castle as its new lord. However, some among the senior vassals dissented from the decision and in 1524 any sense of security was broken when Mōri suffered the defection of his vassal Katsura Hirozumi, and was forced to defeat the traitor in open battle not far from Yoshida-Kōriyama Castle. Also in 1524, Motonari learned of a conspiracy led by a vassal, Sakagami Sosuke, to murder him and elevate his half-brother Aiō Mototsuna to the leadership. The rebellion was crushed at Funayama Castle in April.
Service under Ōuchi clan Along with the family troubles concerning succession, Motonari and Amago Tsunehisa gradually grew hostile towards one another. In March 1525 Motonari and several other local lords decided to change allegiance to Ōuchi Yoshioki. In June, Yoshioki sent his army to Kagamiyama Castle and took it from the Amago clan. Considering Kagamiyama's weak defenses on a low hill, Yoshioki built a new castle called Tsuchiyama Castle at the western edge of Saijo Basin on a high mountain and demolished Kagamiyama.
In 1529 Yoshioki died and was succeeded by his son Ōuchi Yoshitaka. Amago Tsunehisa began negotiating with Takahashi Okimitsu (高橋興光), a maternal relative of the late Mōri Kōmatsumaru who had earlier schemed to place Motonari's brother, Aiō Mototsuna, as head of the Mōri clan. Motonari acted quickly and crushed the Takahashi clan, taking their vast territory from Aki Province to Iwami Province. He paid a high price for the conquest, however, because Motonari's eldest daughter had been a political hostage of the Takahashi clan and was murdered by them in revenge.
A rebellion broke out against the Ōuchi clan in 1532; in response, thirty-two vassals presented Motonari with an oath in which they sought a guarantee that he would not require them to give up their status as small-scale lords, in return for which they promised to jointly undertake the repair of walls and irrigation ditches and the disciplining of traitorous vassals.
On September 25, 1533, Motonari was granted the imperial court rank of the Junior Fifth, Lower Grade in remembrance of his ancestor Ōe no Hiromoto's title. Ōuchi Yoshitaka approved of this and paid the stipend for the position. Although this place at court had become only a sinecure, Motonari nevertheless demonstrated to the other lords in Aki Province that he had the backing of both the imperial court and the Ōuchi clan.
Consolidation of Mōri's holdings In 1534, Motonari began consolidating the Mōri's holdings in Aki, gathering local allies, chief among these being the Shishido, Kumagai, and Amano. He also married one of his daughters to Shishido Takaie (宍戸隆家). In 1535, Tagayama Castle (多賀山城) surrendered to Motonari. Over the next twelve months Motonari defeated the Miya and Tagayama clans. Motonari also made ties with his former enemies, the Aki-Takeda clan and Kumagai clan, creating a strong network of power. By the end of the decade the Ōuchi and Amago families began to see the Mōri with new respect and suspicion. The Amago clearly would not have any faith in Motonari as he had betrayed them and defeated their allies. The Ōuchi were also growing suspicious of the Mōri's growing power, so in 1537, Motonari's eldest son Mōri Takamoto was given as a political hostage to the Ōuchi clan to strengthen their relationship. He would stay until 1540.
In 1539 Ōuchi Yoshitaka fought the Ōtomo clan and Shōni clan of northern Kyūshū, defeating the Shōni clan to win control of the area. In the same year, Sato-Kanayama Castle (佐東銀山城) owned by the Takeda clan on the Amago side fell to the Ōuchi clan despite reinforcements from the Amago clan. The family head Takeda Nobuzane (武田信実) escaped to Wakasa (若狭) where the Takeda had a branch family and later took refuge with the Amago clan.
Siege of Yoshida-Kōriyama Castle