Journalist, translator and literary critic Margaret Fuller (1810-1850) was among the most prominent Unitarians of the nineteenth century, a respected intellectual voice of the American Transcendentalist movement – the movement from which our liberal UU faith developed. She was also, arguably, the nineteenth century’s strongest advocate of women’s rights and the most visionary voice of the feminist movement. Exploring Fuller’s life and work provides insight not only into the soul of Unitarian Universalism but also into how Unitarian Universalism came to embrace revolutionary ideas concerning gender identity, gender diversity, and gender equality.