Ōyama Iwao
When she first returned to Japan, Yamakawa looked for educational or government work, but her options were limited, especially because she could not read or write Japanese. In April 1882, she accepted a marriage proposal from Ōyama Iwao, a wealthy and important general, despite the fact that he had fought on the opposing side of the Battle of Aizu. As her husband was promoted, she was elevated in rank to become Countess, Marchioness, and finally Princess Ōyama in 1905. She was a prominent figure in Rokumeikan society, advising the Empress on Western customs. She also used her social position as a philanthropist to advocate for women's education and volunteer nursing. She assisted in the founding of the Peeresses' School for high-ranking ladies, and the Women's Home School of English, which would later become Tsuda University. She died in 1919 when the 1918 flu pandemic reached Tokyo.