Jennie Wyse Power joined the Ladies Land League in the 1880s, quickly finding a nitch in activities during the Land War. She compiled lists of those evicted from their homes, and went on to organize chapters in Wicklow and Carlow.
Politically active, she helped set up the Irish Women’s Franchise League, and also became a founding member of Inghinidhe na hÉireann and Sinn Féin, as well as Vice-President of both organizations. Jennie was on the Provisional Committee that set up Cumann na mBan, becoming president in 1914.
She became one of the most important women of the revolution. The 1916 Proclamation was written in her home at 21 Henry Street. When discussing the Proclamation, she always maintained that the seven Military Council signed in no particular order with the exception of James Connolly who was eager to be the first to sign. Although it involved considerable risk, Jennie supplied food to the Volunteers of the Rising.
After the Rising, Jennie and her daughter, Nancy, were tireless in their efforts to reorganize the Cumann na mBan, She distributed funds to families suffering hardships, as well as the Prisoners Dependants Fund, money for which had been provided by the Clan na Gael in the United States.