"take Sir Walter Raleigh's letters, for instance"

Sir Walter Alexander Raleigh (1861-1922) was an English critic and essayist who became the first holder of the chair of English Literature at Oxford University, with a fellowship at Magdalen College.

After the outbreak of the First World War in 1914, Raleigh gave up literary criticism and concentrated on writing about  war-related issues. His book England and the War was published in 1918.

Following his death, a collection of his letters (edited by his wife) appeared in 1926, under the title The Letters of Sir Walter Raleigh (1879-1922).

This Sir Walter Raleigh, of course, is not to be confused with his namesake, the Elizabethan colonizer and courtier, famous for introducing tobacco to Europe.