Masanori TSUTSUI who was active at the end of the Edo period was a Junsai's descendant; he was born to the Kuze clan, inherited the Tsutsui clan as an adopted heir, and engaged in negotiation for the Treaty between the Russian Empire and the Empire of Japan at the end of the Edo period.
幕末に日露和親条約の交渉を行った筒井政憲はその末裔である（久世氏の出身で養子として筒井氏を継いでいる）。