Inukai Tsuyoshi
In 1882, Ōkuma co-founded the Constitutional Progressive Party "(Rikken Kaishintō)" which soon attracted a number of other leaders, including Ozaki Yukio and Inukai Tsuyoshi. That same year, Ōkuma founded the "Tokyo Senmon Gakkō" () in the Waseda district of Tokyo. The school later became Waseda University, one of the country's most prominent institutions of higher education.