In 1915, Batthyány and his family moved to the castle of Körmend in Hungary, which he had inherited upon the death of his kinsman Prince Edmund Batthyany-Strattmann in 1914; he also inherited the title of "Prince" (German "Fürst", Hungarian "herceg") and adopted the additional surname of "Strattmann". At Körmend he continued to practise as a doctor, becoming known for treating poor patients for no payment, which gained him the title of "doctor of the poor". Batthyány turned a wing of the castle into a hospital for ophthalmological patients.