was a Japanese daimyà  of the late Sengoku period, and the final head of the Later Hà Âjà  clan. An important figure in the history of AzuchiâÂÂMomoyama politics, he lost his entire domain following the Siege of Odawara (1590). He survived the Siege and carried on as a small daimyà  in the Edo period.
Born in Odawara Castle in 1562, Ujinao was the grandson of Hà Âjà  Ujiyasu and the son of Hà Âjà  Ujimasa and was named . His mother was the daughter of Takeda Shingen.
Coming of age in early 1577, he took the formal name Ujinao. He married Tokuhime, the second daughter of Tokugawa Ieyasu, as a condition for peace between their two clans. In maturity, Ujinao held junior 5th court rank, lower grade (ju-go-i-ge) and the title Sakyà Â-dayu. Later, he took part in the Ujimasa invasion at Kazusa Province. This battle marked the first battle for Ujinao.
In 1582, after the death of Oda Nobunaga, Ujinao and the Hà Âjà  family took advantage of the situation to launch an invasion of the Kai (currently Gunma Prefecture) and Shinano Provinces. However, at the same time, Tokugawa Ieyasu and the Uesugi clan also aspired to seize the vast area in Shinano Province, Kà Âzuke Province, and Kai Province which was ruled by the remnants of many small clans formerly serving the Takeda clan. Ieyasu invaded the Kai and Shinano provinces to establish control there with the consent of senior vassals of the Oda clan. Uesugi Kagekatsu of Uesugi clan also made his move by supporting the former Takeda clan forces under the lead of Ogasawara Dà Âsetsusai from Ogasawara clan and Yashiro Hidemasa at Chikuma and the Nishina clan of Azumino. They defeated and expelled Kiso Yoshimasa, who was granted the control of both Chikuma and Azumino by Oda Nobunaga. However, facing this development, another branch of Ogasawara clan (led by Ogasawara Sadayoshi and his retainers) appealed to the Tokugawa clan and offered their allegiance to Ieyasu. This caused a three-way conflict between those three factions and an event known as the broke out.
By June 13, the Hà Âjà  clan had captured Iwadono Castle in Tsuru District, and instructed Watanabe Shozaemon, a local magnate from Tsuru District, to assist them in their conquest. Subsequently, Sanada Masayuki seized Numata Castle for the Uesugi clan. On June 14 however, Kawajiri Hidetaka killed Honda Nobutoshi. Leading to an uprising from many clans in Kai province against Hidetaka on the following day, which resulted in Hidetaka being killed in June 18. On June 24, Uesugi Kagekatsu of Echigo also advanced into northern Shinano and entered Naganuma castle. Later, Ujinao attacked the location of senior retainer, Takigawa Kazumasu at the Battle of Kanagawa. On the border between the Kà Âzuke and Musashi provinces, Kazumasu faced off against the Hà Âjà  forces at Kanegawa. Kazumasu had 18,000 troops, while the Hà Âjà  wielded 55,000, Kazumasu was defeated and retreated to Nagashima. In response, on July 7, 1582, Toyotomi Hideyoshi sent a letter to Ieyasu authorizing him to dispatch troops to secure the two provinces of Kai and Shinano.
As the main body of the Tokugawa army led by Ieyasu met with the Hà Âjà  clan main army stationed at Wakamiko castle, a series of military engagements between them occurred, where 8,000 of Tokugawa soldiers fought against around 50,000 soldiers of Hà Âjà  soldiers led by Hà Âjà  Ujinao. On July 12 as the troops under Ujinao advanced across Usui Pass, Nobushige resisted them, abandoned the Komoro Castle, and retreated to a fortress which he deemed more suitable to defend against the Hà Âjà  army. Later on July 16 of the same year, Sadayoshi launched an attack on Fukashi Castle, forcing Dà Âsetsusai along with Hidemasa to surrender to Sadayoshi.
In the final phase of the war, the Tokugawa forces engaged in the battle of Kurokoma against the alliance of the Hà Âjà  and the Satomi clans, with the Hà Âjà  clan receiving a 10,000-man reinforcement from Satomi Yoshiyori, ruler of Awa Province (Chiba). During this conflict, Sakakibara Yasumasa stormed one of the castles belonging to the Hà Âjà Â, while Matsudaira Ietada harassed the Hà Âjà  food supplies. Later, during a standoff in Kurokoma, Tokugawa dispatched Mizuno Katsushige and Torii Mototada to lead 2,000 soldiers in a raiding operation, where they managed to repel the 10,000-man Hà Âjà  army detachment led by Hà Âjà  Ujinao. Hà Âjà  Ujikatsu saw this and went to Ujitada's rescue, but was repelled.The Hà Âjà  army ultimately failed to encircle the Tokugawa army from behind and in the end, the Tokugawa clan managed to beat the alliance of the Hà Âjà  and Satomi clans. In the aftermath of the battle of Kurokoma, Ieyasu sent Sakai Tadatsugu in December to subdue Suwa Yoritada at Suwa in Shinano, where Tadatsugu managed to subdue Yoritada and secure his surrender to the Tokugawa clan.
As the war turned in favor of Ieyasu, and combined with the defection of Sanada Masayuki to the Tokugawa side, the Hà Âjà  clan negotiated a truce with Ieyasu. The Hà Âjà  clan then sent Hà Âjà  Ujinobu as a representative, while the Tokugawa sent Ii Naomasa for the preliminary meetings. In October, representatives from the Oda clan such as Oda Nobukatsu, Oda Nobutaka, and Toyotomi mediated the negotiations until the truce officially concluded. It was recorded that the invasion of Satake Yoshishige against the territory of Hà Âjà  also encouraged them to accept the truce with Tokugawa.
In 1590, Odawara fell to a siege at the hands of Toyotomi Hideyoshi; his father and uncle were forced to commit suicide, but Ujinao was spared because he was Tokugawa Ieyasu's son-in-law. Ujinao and his wife were exiled to Mount KÃ Âya, where he died later the following year.
His adoptive son, Hà Âjà  Ujimori, was the first daimyo of Sayama-han (Kawachi Province).