Makabe Iemoto was a kokujin, or provincial landowner, in Hitachi Province. Iemoto served as the lord of Makabe Castle in the Makabe District of Hitachi.
In 1496, Iemoto was born as the son of Makabe Harumoto, a kokujin in Hitachi and lord of Makabe Castle. In the genealogical records of the Makabe clan, he is identified as Munemoto, but only the name of Iemoto can be confirmed from contemporary sources. Iemoto was the father of Makabe Hisamoto.
Records kept at the Rakuhō Temple in Ibaraki Prefecture refer to a donor during the Tenbun era in the name of Makabe Aki-no-kami Iemoto so references to Munemoto in the genealogical records are deemed to be an error made in a later era and the correct name is Iemoto.
When, during the Eishō era (1504 to 1521), Ashikaga Masauji (the Koga kubō) and his eldest son, Ashikaga Takamoto, clashed against one another, the Makabe clan initially backed Masauji but, in the midst of the conflict, switched sides in support of Takamoto. This change in position appears to have been a trigger for succession in the headship of the clan.
During the Daiei era (1521 to 1528), when Takamato served as the Koga kubō, Iemoto backed Takamoto’s youngest brother, Ashikaga Takayori and fought against Takamoto and Oda Masaharu. After Takayori fled for protection to another one of Takamoto’s younger brothers, Ashikaga Yoshiaki, the Oyumi kubō, he had Masaharu and Daijō Tadamoto settle and backed Ashikaga Haruuji, the eldest son of Takamoto.
In 1546, at the Siege of Kawagoe Castle in Musashi Province, Iemoto appears, along with Oda Masaharu, to have supported Ashikaga Haruuji, but a defeat to Hōjō Ujiyasu put him in a difficult situation.
At some point from the end of the Tenbun era to the Kōji era, Iemoto retired and entered the priesthood, adopting the monk’s name of Choboken. He then built a residence near Mount Tsukuba.
Similar to other branches of the Daijō clan, Iemoto’s family had a close affiliation with the Kashima Shrine and sought to protect it. Meanwhile, Iemoto excelled in renga, or linked-verse poetry, and maintained cordial relations with a renowned master named Sōboku.