まもなく三河国田原藩重役渡辺崋山と知り合い、その能力を買われて田原藩のお雇い蘭学者として小関三英や鈴木春山とともに蘭学書の翻訳に当たった。

After a short while, Choei got acquainted with Kazan WATANABE, a senior vassal of the Tahara Domain of Mikawa Province and was employed as a Dutch scholar at the domain for his brilliant talent, where he translated Western studies literature with Sanei KOSEKI and Shunzan SUZUKI. - Wikipedia日英京都関連文書対訳コーパス

渡辺崋山（田原藩三宅氏家老。天保期の藩政改革で幕府より唯一表彰に預かる。蘭学者として有名）。

Kazan WATANABE (A Karo officer of the Miyake family in the Tahara domain. He was the only one to receive an official commendation from the bakufu in the movements to reform domain government administration in the Tenpo era [1830 - 1844]. He is famous as a Rangakusha scholar [a person who studied Western sciences thorough the Dutch language] as well.) - Wikipedia日英京都関連文書対訳コーパス

蛮社とは、田原藩士渡辺崋山、高野長英、小関三英ら洋学者を中心に町医者・藩士・幕臣等有志の者が海防目的で蘭学や内外の情勢を研究していた尚歯会（しょうしかい）を、「蘭学という野蛮な結社」と国学者の側が蔑んだことによる。

Feudal retainers of Tahara domain, Kazan WATANABE, Choei TAKANO and Dutch scholar Sanei KOSEKI organized Shoshikai (association) with interested people like town doctors, feudal retainers of domain and vassals of shogun in order to study Western learning and internal and external situation for the purpose of coastal defense, and scholars of Japanese literature named the organization as Bansha, which has the disdainful meaning "Kessha (association) studying Yaban (barbarous) Western science." - Wikipedia日英京都関連文書対訳コーパス