Sir Robert de Manners performed one of the earliest English translations from the Arabic of the Taqwim al-Sihhah, an 11th-century medical text by Ibn Butlan, and was known throughout the region as a healer.
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In 1906 he bought the Ford Castle estate, Ford, Northumberland and in 1908 the Etal Castle estate, Etal, Northumberland, both of which remain in the ownership of the Joicey family.