Hidemasa was born inside the
Owari Province in 1540, as the child of one of the servants of
Oda clan. He became the de-facto owner of
Kishiwada Castle in July 1585 with 4,000
kokudaka, although he was considered a local magistrate at this period. He was given an additional 6000
koku worth of land in the
Izumi Province in 1594. After
Maeno Nagayasu lost power in 1595 due to
Toyotomi Hidetsugu's
seppuku after Hidetsugu was accused of plotting a rebellion, Hidemasa was given an additional 20,000 koku worth of land and became the official owner of the Kishiwada castle. After
Toyotomi Hideyoshi's death in 1598, Hidemasa was ordered to support
Toyotomi Hideyori and protect two gates in the
Osaka Castle. After Hideyori moved from the
Fushimi Castle to the Osaka Castle in 1599, it was decided that Hidemasa, along with Ishikawa Sadakiyo, Ishida Masazumi, Ishikawa Yoriaki, and
Katagiri Katsumoto will be helpers of Hideyori. In January 1600, both Ishikawas and Ishida were removed from this position, leaving only two with this role left. Before the battle of
Sekigahara, Hidemasa's second child, Hideie led 300 troops join the forces attacking
Uesugi Kagekatsu. However, when
Ishida Mitsunari rebelled, the rest of his children and Hidemasa himself sided Mitsunari. His children participated in the
Siege of Tanabe and
Siege of Ōtsu. After Mitsunari lost the clash at Sekigahara, Hidemasa and their children was about to face severe punishments. However, all lands owned by the Koide clan were kept due to Hideie's siding with the
Tokugawa clan in the battle of Sekigahara, with Hidemasa pardoned thanks to Hideyori. Hidemasa died at the age of 65 on April 21, 1604. His body was buried in Honkoku-ji, with the
Kishiwada Domain he ruled succeeded by Yoshimasa, his first son. ==References==