Towards the end of his life, Harington tutored Henry Frederick, Prince of Wales. He annotated for him a copy of Francis Godwin's "De praesulibus Angliae" (Of the rulers of England). Harington's grandson, John Chetwind published these annotations in 1653 under the title "A Briefe View of the State of the Church". While tutoring the Prince, Harington also translated from Italian to English verse "Regimen sanitatis Salernitanum" (Health regimen of the School of Salernum), a medieval collection of health tips. The translation was published in 1607 in London.