Cause of death: heart attack
Auguste-Maurice Barrès (French: [baʁɛs]; 19 August 1862 – 4 December 1923) was a French novelist, journalist, philosopher, and politician. Spending some time in Italy, he became a figure in French literature with the release of his work The Cult of the Self in 1888. In politics, he was first elected to the Chamber of Deputies in 1889 as a Boulangist and would play a prominent political role for the rest of his life.
Source : Wikipedia