1910 Three Philosophical Poets: Lucretius, Dante, and Goethe published as first volume in the series Harvard Studies in Comparative Literature.

1911 In April Santayana delivers his final lecture at Harvard. Travels to Wisconsin and California.

1912 Santayana departs America for the last time on 24 January. Mother dies on 5 February. Takes an extended holiday through Italy from September–November, finishing in Florence, Italy where he stays with his friends, the Berensons.

1913 Winds of Doctrine: Studies in Contemporary Opinion published in January while Santayana is in Monte Carlo. Travels to Brussels from 3-6 July to visit Baron Albert von Westenholz. Following this trip, the two men lose contact until 1920 because of the war.

1914 World War I breaks out; Santayana remains in England, with his home base in Oxford, until April 1919.

1915 Egotism in German Philosophy published (published in London in 1916.) Santayana moves to 22 Beaumont Street, Oxford, England, which becomes his permanent residence during the war.

1919 In June, Santayana leaves England for the first time since 1914. He travels to Paris and resides at Charles Strong’s apartment from 26 June to 26 November.