Background
Leo Gamō Ujisato was a Japanese daimyō of the Sengoku and Azuchi–Momoyama periods. The heir and son of Gamō Katahide, lord of Hino Castle in Ōmi Province, he later held Matsusaka (Ise Province) and finally Aizuwakamatsu Castle in Mutsu Province. He also controlled Obama Castle through one of his retainers, Gamō Chūzaemon.
Ujisato, known in his childhood as Tsuruchiyo, was born in Hino, in the Gamō district of Ōmi Province in 1556. In 1568, Oda Nobunaga, who was en route to Kyoto, defeated the Rokkaku clan, who were the masters of Tsuruchiyo's father, Katahide. Upon the Rokkaku clan's defeat, Katahide as a former influential vassal, pledged loyalty to Nobunaga, and became an Oda retainer. However, the price of Katahide's pledge was giving up his son as a hostage, and so Tsuruchiyo was taken to Gifu, then the Oda clan's headquarters.
Tsuruchiyo's sagacity impressed Nobunaga, and soon, the young man had his manhood rite in Gifu, taking the name Yasuhide. In the summer of 1569, Yasuhide took part in his first campaign, during Nobunaga's subjugation of Kitabatake Tomomasa of Kizukuri Castle. For his distinction in battle, Nobunaga gave his daughter Fuyuhime in marriage to Yasuhide, affectionately referring to Yasuhide as "my little son-in-law." At the same time, he was allowed to return to his father's castle at Hino. Though Fuyuhime was still young at this point, she is said to have later matured into a stunningly beautiful woman.
Following the betrayal of Azai Nagamasa, Gamō Katahide assisted in Nobunaga's withdrawal from Kanegasaki by taking him into his own Hino Castle, and facilitating his escape to Gifu from there. In recognition of this feat, Nobunaga gave Yasuhide and his father a stipend increase, and posted them to southern Omi, under the command of Shibata Katsuie.
In 1570, Yasuhide fought at the Battle of Anegawa, and later that same year, joined his father in the Oda assault on the Asakura clan of Echizen Province. The two led a force of 1,000 men as the vanguard of Shibata Katsuie's army. The total number of men under Katsuie's overall command at that battle totaled 5,000. Of those 5,000, the number under Katsuie's command totaled 600, so this may give some impression of the importance of the Gamō family.
The Gamō would see action against the Asakura once more, in 1573. In 1575, upon Katsuie's posting to Kitanoshō Castle, the Gamō, ruling from their castle at Hino, came under Nobunaga's direct command, serving as hatamoto. In 1581, he participated on Second Tenshō Iga War in the Siege of Hijiyama.
When Nobunaga was assassinated in 1582, Yasuhide was with his father, who had been posted as warden of Azuchi Castle. Together, the two sheltered Nobunaga's wife and children in Hino Castle, saving their lives. In the same year, Yasuhide submitted to Hashiba Hideyoshi. The following year, he joined Hideyoshi's attack on Takigawa Kazumasu, as well as the Battle of Shizugatake, and received the title of Hida no Kami. In this year, his son Tsuruchiyo (Gamō Hideyuki) was born.
Following his siege of Oda Nobukatsu at Kanie castle during the Battle of Komaki and Nagakute in 1585, he received Matsusaka, in the southern section of Ise Province, as his fief (rated at 120,000 koku). The main castle of this fief was Matsugashima Castle. After taking part in the subjugation of Kii Province and Kyushu in 1585, Yasuhide took the name of "Ujisato." Soon after, due to the influence of Takayama Ukon, he received a Christian baptism in Osaka, and took the baptismal name of Leo.
In 1588, construction was completed on Matsusaka Castle, where he immediately moved. Ujisato took part in all of Hideyoshi's subsequent campaigns: Kyushu Campaign, the Siege of Odawara (1590), and the pacification of Ōshū (Mutsu and Dewa Provinces) (1590). For his role in the pacification of Ōshū, he received a 420,000 koku fief with its headquarters at Kurokawa Castle in Aizu. He renamed the castle Wakamatsu, the name which even the town retains to this day.
In preparation for the Japanese invasions of Korea, Ujisato proceeded in 1592 to Hideyoshi's base in Nagoya in Hizen Province. He fell ill there, coughing up blood in early 1593. From Nagoya, he headed first to Aizu, and then to Fushimi, where the Gamō family's mansion was almost complete. Hideyoshi himself would visit the mansion twice after its completion.
Ujisato died in 1595, at age 40, at Fushimi Castle. Though his family would lose Aizu soon after with Gamō Hideyuki's transfer to Utsunomiya, the Gamō would later be returned to Aizu by Tokugawa Ieyasu.
Character
Likes: Yakiniku, ghost stories
Dislikes: Tantrums, poison
Talent: Calligraphy, tea ceremony
A easy-going average joe who's easily the most approachable fellow out of his friend group. Compared to his companions, Leo doesn't have the quickest nor most eloquent wit, but as he makes up for it with an abundance of heart, he's very popular with the common man both during when he was alive and in the present day.
Leo dislikes using violence where words will suffice, but reveals himself a terrifyingly capable fighter when push comes to shove. That said, the moniker of "longest temper under Heaven" isn't a mere jest; he possesses an extraordinary amount of patience when dealing with others (except for a certain person), so his warrior persona rarely comes out.
Leo's wish to the Holy Grail is "to fight alongside my friends". The days where he fought alongside his closest allies and walked in the Way of Tea with his fellow disciples are extremely precious to Leo, and his greatest regret is his sudden death by sickness that accomplished nothing but make his wife a widow, his children orphans, and his friends strangers.
Relationships
Master
Leo's wish to the Grail and his down-to-earth personality makes him an extremely easy Servant to handle, even for novice Masters. However, care should be taken to not make him angry; even his considerable patience can be worn thin by unreasonableness.
Oda Nobunaga
"Wow, it's Lord Nobunaga! I look forward to working with you agai-- Huh? 'Hide me in your castle again, Tsurucchi'? Uh, sure, but-- Ah, she left. Uh, can you wait here for a bit, Master? Gotta make sure my place isn't a mess before Lord Nobunaga gets there."
Justo Takayama
"I feel more at ease now, knowing that my boy Justo's on our side. He's had my back even when we were alive... I guess it warms my heart to know even death can't break our bond."
Francisco Otomo
"That guy... Even though we're basically polar opposites in terms of personality, it seems like we ended up on death's door the same way. And that really bugs me. Is dying a worthless death the sole legacy of us Toshi?"
Hosokawa Tadaoki
"Haaaah? What do I think of that immature, stuck-up, walking piece of human trash? Well, it's loads of fun seeing him try and maintain his composure when he's being given the third degree, and he does have his moments of basic decency like that one time he sent me a home remedy when I got sick... What I'm trying to say here is that while Tadaoki is trash, he's our trash. And I wouldn't want him any other way."
Semiramis
"Wow, that lady's real easy on the eyes, no doubt about that... but even she's got nothing on my old girl! --Huh. Why did the air start smelling of poison all of a sudden?"