Pierre-Alexandre Le Camus, a Creole from Martinique, met Jérôme Bonaparte around 1803 when the latter was forced to stay on the island because he was suffering from yellow fever.

When Jérôme was made King of the newly created Kingdom of Westphalia for him by his brother in 1807, Le Camus became First Chamberlain, First Secretary and Grand Master of the Wardrobe.

It is therefore essential that you reverse this measure... (or else it is necessary) that Mr. Lecamus renounce the character of French citizen...Jérôme, who according to Napoleon's envoy Karl Friedrich Reinhard could do nothing, not even fall asleep, without Le Camus, chose the second option and continued to prefer his favourite.

Le Camus sold the lordship of Immichenhain on 11 August 1809 to Jérôme's court marshal, Baron Anne-François Louis Bertrand de Boucheporn.

Arthur Kleinschmidt wrote in his 1893 History of the Kingdom of Westphalia: "Penetrating was his intellect, but his character ignoble; in spite of all intrigues he remained the favourite of the king, to whom, as Reinhard said, he was indispensable to sleep; he wasted time, did little evil and nothing good, and his own feeling of how little he could accomplish gave him a genteel reserve.

Claire Adélaïde Le Camus (1789–1874) married the French general and Westphalian war minister Joseph Antoine Morio (1771–1811) and, in her second marriage, the admiral Baron Victor Guy Duperré (1775–1846), with whom she had three children.

Rose Claire Antoinette Le Camus (died 1854) married André-François Ocher de Beaupré (born 1776), who became General and in 1839 Inspecteur Général of Algeria, and with whom she had a daughter and a son.