In the 1890s Sybil Thomas became president of the Welsh Union of Women's Liberal Associations, which was strongly feminist and pro-
female suffrage. She was also a prominent moderate in the
National Union of Women's Suffrage Societies. Her sisters
Janet and Charlotte were also prominent suffragettes and both went to prison for acts of violence in the name of the cause. Her daughter,
Margaret Haig Thomas, became one of the most prominent British feminists of the inter-war years. Under their influence, Sybil joined the more militant
Women's Social and Political Union. In 1914 she was sentenced to one day's imprisonment after holding a public meeting outside the
Houses of Parliament. ==First World War==