Etsufu

…Imamachi is also called Naoetsu, and is referred to as Naoe no Tsu and Naoi no Ura in the Yoshitsune-ki, Sanso-dayu, and the Noh song Basoten, and in Basoten it is said that Toi no Saemon Koresuke engaged in human trafficking. The city developed as the Echigo provincial capital and was called Fuchu, Funai, and Echigo. It was an important port for exporting rice and Echigo's specialty blue indigo to Kyoto, and indigo ships loaded with blue indigo and Echigo fine cloth were sent from Naoetsu to Tsuruga and Obama. …

*Some of the terminology explanations that mention "Etsufu" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…今町は直江津ともいい，《義経記》《山荘太夫》，謡曲《婆相天（ばそうてん）》などに直江の津，直井の浦とあり，《婆相天》には問（とい）の左衛門これすけが人身売買をおこなったとある。市街は越後国府が発展して，府中，府内，越府と呼ばれた。京畿へ米や越後特産の青苧（あおそ）を移出する重要な港で，青苧や越後上布を積んだ苧船（おぶね）で直江津から敦賀，小浜へ送られた。…

※「越府」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報