Ujiie Naomoto served as a bushō during the Sengoku period.  He was the twelfth head of the Ujiie clan and, along with Inaba Yoshimichi and Andō Morinari, was one of the Western Mino Group of Three.  After entering the priesthood, he adopted the name of Bokuzen by which he is known.

The Ujiie were an illegitimate branch of the Utsunomiya clan descended from the Fujiwara-Hokke.  During their period of peak prosperity, the Ujiie clan held one-third of Mino Province while Naomoto wielded the most power among the Western Mino Group of Three.

Initially, Naomoto served as a retainer of Toki Yoriaki, the military governor of Mino.  After Yoriaki was ousted by Saitō Dōsan, he became a retainer of Dōsan.  Following the death of Dōsan in 1556, Naomoto served Dōsan’s son, Saitō Yoshitatsu, and grandson, Saitō Tatsuoki.  Naomoto did not get along well with Tatsuoki so, in 1567, together with Inaba Yoshimichi and Andō Morinari, colluded with Oda Nobunaga during the Siege of Inabayama Castle.  Thereafter, he became a retainer of the Oda clan and, around this time, adopted the name of Bokuzen.

In 1568, Naomoto obeyed Nobunaga during his march to the capital.  Naomoto served at the Siege of Ōkawachi Castle (defended by Kitabatake Tomonori) in 1569 and the Battle of Anegawa in 1570.

In 1571, during the Nagashima Ikkō-ikki (attacks on Ise-Nagashima by Oda Nobunaga against followers of the Hongan Temple in Ise from 1570 to 1574), Naomoto acted upon orders to burn down the Tado Grand Shrine in the Kuwana District of Ise Province including the main shrine in addition to the setsumatsusha (small shrines accompanying the main shrine), the sacred treasures, ancient records, and the Hōun Temple (affiliated with the Shingon sect of Buddhism) on the grounds of the Tado Grand Shrine further including halls, pagodas, and monasteries totaling over seventy structures.  Thereafter, Naomoto joined the forces commanded by Shibata Katsuie and, when the Oda army withdrew, he served in the rear guard.  On 5/12, he was killed in Ishizu in Mino by Sasaki Sukenari (a member of the Rokkaku clan) who, along with the forces from the Hongan Temple, fought against the Oda army.  Naomoto is deemed to have been thirty-eight years old although, according to one historical account of Mino, he was fifty-nine years old.  A memorial tower to Bokuzen stands in Yasue in the town of Nannō in the city of Kaizu in Gifu Prefecture.

Naomoto was succeeded by his lineal heir, Ujiie Naomasa.  His second son, Ujiie Yukihiro, became a daimyō and served on behalf of Toyotomi Hideyori in the Winter Campaign of the Siege of Ōsaka in 1614 and the Summer Campaign of the Siege of Ōsaka in 1615 during which he took his own life.  His third son, Ujiie Yukitsugu, also served as a daimyō.