Because Munetane left Shimousa Province, and also because it was in the period of the Northern and Southern Courts, his honryo (main domain) in Shimousa Province was usurped by Munetane's younger brother, Tanemune CHIBA.
宗胤は下総を離れたため、南北朝時代であったこともあり宗胤の弟・千葉胤宗に千葉氏の下総の本領を横領された。