島津忠久　比企尼の娘、丹後内侍の子　　源頼朝の推挙で島津荘下司に【研究者と学ぶ日本史　鎌倉時代】

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.