Shibata Katsuie was one of Nobunaga's captains and one of the Boys from Owari. Katsuie was born at Shimoyashiro Castle.
Here is two links related to the Shimoyashiro Castle landmark located in the Nagoya City area.
The date to look for on Hide's link is 7/10/09. His post on Shibata Katsuie's birth place is rich and has plenty of feedback.
Nobunaga no tame!