From the Kamakura era onwards, the Oshida clan served the Chiba clan as chief retainers and, again and again intermarried with their masters' daughters, leading to their inclusion and treatment as if they were clan members.
押田氏は鎌倉時代以降、千葉氏の家老として活躍し、しばしば主家の姫と婚姻して千葉氏の一門並の待遇を許される。