Lucretia Mott and her husband attended the famous World's Anti-Slavery Convention in London in 1840, the one that refused to allow women to be full participants. This led to her joining Elizabeth Cady Stanton in calling the famous Seneca Falls Convention in New York in 1848 (at which, ironically, James Mott was asked to preside), and from that point on she was dedicated to women's rights and published her influential Discourse on Woman (1850).
While remaining within the Society of Friends, in practice and beliefs Mott actually identified increasingly with more liberal and progressive trends in American religious life, even helping to form the Free Religious Association in Boston in 1867.