Sesshōmaru's mother's manor

Sesshōmaru's mother's palace is a location that was first introduced in InuYasha The Final Act and Chapter 467.

History
Over 500 years ago in the Heian Period, the Great Dog Demon and Kirinmaru confronted the Grim Comet with Blasting Barrage and Meidō Zangetsuha.

Inuyasha
In Sesshōmaru in the Underworld, Inuyasha notices a cloud shaped like a dog, which carries Sesshōmaru's scent as Sesshōmaru, Jaken, Rin and Kohaku arrive at the palace when Sesshōmaru requests his mother to aid in mastering the Meidō Zangetsuha technique.

Hanyō no Yashahime
During the flashback in Farewell Under the Lunar Eclipse, Sesshōmaru, Inuyasha, Kagome and Jaken arrive at the palace when the owner was away to take care of the incoming Grim Comet threat.

The palace made an appearance in The Three Princesses Strike Back, where Kirinmaru visits the woman following the recent incidents involving Zero and the Half-Demon Princesses.