Sir Pierre Louis Napoleon CavagnariKCBCSI (1841–1879), British military administrator, was the son of Count Louis Adolphus Cavagnari, of an old Italian family from Parma in the service of the Bonaparte family, by his marriage in 1837 with an Anglo-Irish lady, Caroline Lyons-Montgomery. Cavagnari was born at Stenay, in the Meusedépartement, France, on 4 July 1841.
Cavagnari sitting with a group of Afghan tribesmen.
In September 1878 he was attached to the staff of a British mission to Kabul, Afghanistan, which the Afghans refused to allow to proceed through the Khyber Pass. In May 1879, after the British-Indian forces had invaded Afghanistan, and the death of Afghan EmirSher Ali Khan, Cavagnari negotiated and signed the Treaty of Gandamak with Sher Ali Khan's son and successor, Mohammad Yaqub Khan. With this treaty, the Afghans agreed to admit a British representative to Kabul, and the post was conferred on Cavagnari, who also received the Star of India and was made a KCB. He took up his residence in July 1879. On 3 September 1879, Cavagnari and the other European members of the mission, along with their guards who were made up of The Guides, were killed after he refused the demands of mutinous Afghan troops. Cavagnari was survived by his wife, Lady Cavagnari (née Mercy Ellen Graves), whom he had married in 1871.