関東管領上杉氏Ⅲ　上杉謙信（長尾景虎）越後守護代から関東管領へ【秦野裕介日本史講座】

New channel 日本史オンライン講座: title sample judged 'whole' (A dedicated Japanese history teaching channel with lecture series, scholar-led seminars, and structured courses that ove); 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.

A 61-minute video from 日本史オンライン講座: “関東管領上杉氏Ⅲ　上杉謙信（長尾景虎）越後守護代から関東管領へ【秦野裕介日本史講座】”.

Video by 日本史オンライン講座, played through YouTube's embedded player.