was a samurai commander in the Azuchi-Momoyama period

Azuchi-Momoyama period

The came at the end of the Warring States Period in Japan, when the political unification that preceded the establishment of the Tokugawa shogunate took place. It spans the years from approximately 1573 to 1603, during which time Oda Nobunaga and his successor, Toyotomi Hideyoshi, imposed order...

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Shibata Katsuie

Shibata Katsuie

or was a Japanese military commander during the Sengoku Period who served Oda Nobunaga.-Biography:Katsuie was born in the Shibata family, a branch of the Shiba clan . Note the differences between , , and the .Katsuie was the retainer of Oda Nobukatsu...

 was his uncle, and Katsutoyo was adopted.

The meeting in Kiyosu Castle was held after Oda Nobunaga

Oda Nobunaga

was the initiator of the unification of Japan under the shogunate in the late 16th century, which ruled Japan until the Meiji Restoration in 1868. He was also a major daimyo during the Sengoku period of Japanese history. His opus was continued, completed and finalized by his successors Toyotomi...

 died.
As the result of that, Katsuie got Nagahama Castle

Nagahama Castle

is a hirashiro located in Nagahama, Shiga Prefecture, Japan.-History:Nagahama Castle was built in 1575-1576 by Hashiba Hideyoshi in the village then called Kunitomo, renaming the area Nagahama. Previously, he had ruled from Odani Castle, though found this hard to do as it was a yamashiro...

 at Ōmi Province

Omi Province

is an old province of Japan, which today comprises Shiga Prefecture. It was one of the provinces that made up the Tōsandō circuit. It is nicknamed as .Lake Biwa, Japan's largest lake, is located at the center of the province...

 and let Katsutoyo defend it. However, Katsuie favored his other adopted son, Shibata Katsumasa, and disfavored Katutoyo.
In addition, Katsutoyo was on bad terms with Sakuma Morimasa

Sakuma Morimasa

was the son of Sakuma Moritsugu, cousin of Sakuma Nobumori, a prominent Oda retainer to Oda Nobuhide and Oda Nobunaga. He was a retainer of Shibata Katsuie and one of his top generals in many of his campaigns...

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Because of that, he changed sides to Hashiba Hideyoshi

Toyotomi Hideyoshi

was a daimyo warrior, general and politician of the Sengoku period. He unified the political factions of Japan. He succeeded his former liege lord, Oda Nobunaga, and brought an end to the Sengoku period. The period of his rule is often called the Momoyama period, named after Hideyoshi's castle...

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He sent retainers as his proxies to the Battle of Shizugatake

Battle of Shizugatake

The was a battle in Sengoku period Japan between supporters of Toyotomi Hideyoshi and Oda Nobutaka.In May, 1583, a former general of Nobunaga's named Shibata Katsuie coordinated a number of simultaneous attacks on Shizugatake, a series of forts held by Hideyoshi's generals among whom was Nakagawa...

in 1583 since he was ill.
Kastutoyo died from a disease soon after the battle.