Théophile Jeusset
Théophile Jeusset (25 April 1910 – 14 May 1968) was a Breton nationalist writer and far-right political activist in France. He also used the Breton name Jean-Yves Keraudren. Born in Rennes, he grew up with strong Breton nationalist ideas.
He began with the Breton Autonomist Party, then formed Breiz da Zont and its political wing, the Breton Integral Nationalist Party (PNIB), which was very small. Jeusset later joined with Gwilherm Berthou and Célestin Lainé to start Kentoc'h Mervel (Sooner Death), a group for direct action. Lainé pushed for a more tightly organized group, which led to Gwenn ha Du, a terrorist cell. After Gwenn ha Du’s first violent act, Jeusset was arrested and detained.
In 1931, he wrote that Breton nationalism was linked to antisemitism, expressing hateful ideas about Jews and others.
During World War II, Jeusset initially allied with Olier Mordrel, who founded the Breton National Party modeled on the Nazi Party. He later broke with Mordrel and formed the Breton Social-National Workers' Movement, but it drew few followers. He eventually joined Lainé's Bezen Perrot militia, which was affiliated with the SS.
After the war, Jeusset was captured and sentenced to life in forced labor, though he was released in 1951. In 1965 he published an autobiographical memoir, A Contre-courant (Against the Current). He died in Nantes on 14 May 1968 at the age of 58.
This page was last edited on 2 February 2026, at 16:35 (CET).