Thomas Jefferson Hogg was a British barrister and writer best known for his friendship with the Romantic poet Percy Bysshe Shelley. Hogg was raised in County Durham, but spent most of his life in London. He and Shelley became friends while studying at University College, Oxford, and remained close until Shelley's death. During their time at Oxford they collaborated on several literary projects, culminating in their joint expulsion following the publication of an essay titled "The Necessity of Atheism". They remained good friends, but their relationship was sometimes strained because of Hogg's attraction to the women who were romantically involved with Shelley.

Percy Bysshe Shelley was a British writer who is considered as one of the major English Romantic poets. A radical in his poetry as well as in his political and social views, Shelley did not achieve fame during his lifetime, but recognition of his achievements in poetry grew steadily following his death, and he became an important influence on subsequent generations of poets, including Robert Browning, Algernon Charles Swinburne, Thomas Hardy, and W. B. Yeats. American literary critic Harold Bloom describes him as "a superb craftsman, a lyric poet without rival, and surely one of the most advanced sceptical intellects ever to write a poem."