Seán Treacy was a grandson of John Treacy. He was born in 1895 in Soloheadbeg, Co. Tipperary to Denis Treacy and Bridget Allis.

From an early age Seán had nationalist leanings, and in his teens he joined the Irish Republican Brotherhood (which later evolved into the IRA). In January 1919 Seán took part in the Soloheadbeg ambush which was the first military incident of the War of Independence. He subsequently led attacks against the British in Dublin and in various locations in Munster but on 14 October 1920 he was shot dead on Talbot St. in Dublin by members of the British forces.

The pages shown are from Desmond Ryan's 1945 book, 'Seán Treacy and the Third Tipperary Brigade IRA' .

Seán was a first cousin of Thomas Treacy (see previous photo).