[1] When the London Philhellenic Committee was formed, Millingen was recommended to it by William Smith, and on 27 August 1823 he left England for Corfu, with letters of introduction to the Greek government and to Lord Byron.
He later accompanied him to Missolonghi, and attended him in his last illness, which, at the autopsy, Millingen pronounced to be purulent meningitis He was accused by Francesco Bruno, another of Byron's doctors, in an article in the Westminster Review, with having caused his death by delaying phlebotomy.
[2] Soon after Byron's death in 1824, Millingen had a severe attack of typhoid fever; on recovering he was appointed surgeon in the Greek army, in which he served until its surrender to the Turks.
[5] At that time the paper was owned by David Urquhart and financed by Richard Crawshay, both soon to become involved in the building of the Hammam Turkish Bath at 76 Jermyn Street, London.
He discovered the ruins of Aczani in Phrygia, an account of which was published by George Thomas Keppel, and excavated the site of the temple of Jupiter Urius on the Bosphorus.
[1] Millingen published:[1] He also contributed an article in French on "Oriental Baths" to the Gazette Médicale d'Orient, 1 January 1858.
[1] Millingen separated from his first wife Marie Angélique Dejean (1812–1873), a Roman Catholic who then embraced Islam, and was married twice.