was a Japanese ''

daimyō were powerful Japanese magnates, feudal lords who, from the 10th century to the early Meiji era, Meiji period in the middle 19th century, ruled most of Japan from their vast hereditary land holdings. They were subordinate to the shogun and no ...

'' of the

Edo period The , also known as the , is the period between 1600 or 1603 and 1868 in the history of Japan, when the country was under the rule of the Tokugawa shogunate and some 300 regional ''daimyo'', or feudal lords. Emerging from the chaos of the Sengok ...

, who ruled the Uruido, Koga and Yodo Domains. The eldest son of Nagai Naokatsu, he fought at the

Battle of Sekigahara The Battle of Sekigahara (Shinjitai: ; Kyūjitai: , Hepburn romanization: ''Sekigahara no Tatakai'') was an important battle in Japan which occurred on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu Prefecture, ...

and the

siege of Osaka A siege () . is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-prepared assault. Siege warfare (also called siegecrafts or poliorcetics) is a form of constant, low-intensity conflict charact ...

. During the

Shimabara Rebellion The , also known as the or , was an rebellion, uprising that occurred in the Shimabara Domain of the Tokugawa shogunate in Japan from 17 December 1637 to 15 April 1638. Matsukura Katsuie, the ''daimyō'' of the Shimabara Domain, enforced unpo ...

he was assigned to defend

Kyoto Kyoto ( or ; Japanese language, Japanese: , ''Kyōto'' ), officially , is the capital city of Kyoto Prefecture in the Kansai region of Japan's largest and most populous island of Honshu. , the city had a population of 1.46 million, making it t ...

. Naomasa held and the title of '' Shinano no Kami''. He retired in early 1658 and became a monk, taking the name Shinsai.

References

Yodo domain on "Edo 300 HTML"
(11 December 2007)

(11 December 2007) , - , - Japanese Buddhist clergy Daimyo 1587 births 1668 deaths {{daimyo-stub