The diaries of Dr Kathleen Lynn, 1916-1955, cover her involvement in the 1916 Rising, the War of Independence, the Civil War, and the formative three and a half decades of the Irish Free State. They demonstrate the revolutionary, socialist and feminist fervour of a radical revolutionary woman, what motivated her and the work she did for women, workers, and Ireland. The diaries, held in the archives of the Royal College of Physicians of Ireland (RCPI), reveal the often-difficult road that radical political women forged in the new Irish Free State, which viewed women through the constraining lens of marriage, motherhood, and domesticity.

Central to the diaries is Lynn's vital work in St Ultan's Hospital for Sick Infants which she co-founded in 1919. Her diaries demonstrate vividly the number of women who led advances in medical care in the first decades of the State alongside Lynn. The diaries also record her family and personal relationships, especially her lifelong relationship with fellow suffragist, revolutionary and social campaigner, Madeline ffrench-Mullen.