65. Succory, cichorium, an Intube; erratic and wild, with a narrow dark Leaf, different from the Sative, tho' probably by culture only; and for being very bitter, a little edulcorated with Sugar and Vinegar, is by some eaten in the Summer, and more grateful to the Stomach than the Palate.
"Acetaria: A Discourse of Sallets"
John Evelyn
The Succory or cichorium was known to the Romans, and was eaten by them as a vegetable, or in salads.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie