Miyatsu

Miyatsu is the paternal grandfather of Miroku, who was cursed by Naraku (at that time disguised as a woman) 50 years ago. He was the first in his line to bear the Wind Tunnel (Kazaana). Though not often mentioned throughout the series, Miyatsu is depicted as having immense skill as a holy-man and powerful spiritual abilities. In InuYasha the Movie: The Castle Beyond the Looking Glass, it is revealed that it was he who sealed Kaguya within her own mirror.

According to Miroku, Miyatsu was, like his son and grandson, quite the ladies' man (aka a lecher).

Reference
Miyatsu Miyatsu 弥萢