of whom were born while their father was in prison: Prince Alphonse (1826–1863), born during his father's ambassadorship in London. He entered Polytechnique in 1849 and formulated Polignac's conjecture the same year. He married Jeanne Emilie Mirès (called Amelie by Kahan) and had one daughter. He died some time after a very public trial exonerated his father-in-law Jules Mirès of embezzlement. Prince Ludovic or "Louis" (1827–1904), born during his father's ambassadorship in London. He entered Polytechnique in 1851 and pursued a military career. He married in 1874 Gabriele, Princess von Croy, with no issue. Princess Yolande (1830–1855), named after her mother Gabrielle de Polastron, Duchess of Polignac. She was born shortly before her father's incarceration as an Ultra. In 1848, she married Sosthène II de La Rochefoucauld, duc de Doudeauville. Prince Camille (1832–1913), a major-general in the Confederate Army during the American Civil War. He married twice: by his first marriage, he had one daughter; by his second marriage, he had two daughters and one son, Prince Victor de Polignac (1899–1998). He has issue and descendants through his eldest daughter. Prince Edmond (1834–1901), later a noted musician and composer, who married Winnaretta Singer in a famous mariage blanc. The couple's marriage was annulled by the French Chamber of Peers, but Jules and Charlotte went to England after his release in 1836, and they renewed their vows before the French consul in 1837. Career Returning to France, which was then ruled by Napoleon Bonaparte, Jules continued in his zealous loyalty to the exiled Royal Family. In 1804, a year after his sister's death, Jules was implicated in the conspiracy of Cadoudal and Pichegru to assassinate Bonaparte, and was imprisoned until 1813. After the restoration of the Bourbons, he was rewarded with various honours and positions. He held various offices, received from the pope his title of "Prince," in 1820, and in 1823, King Louis XVIII made him ambassador to Great Britain. A year later, his mother's former friend ascended the throne as King Charles X. Polignac's political sympathies did not alter, and he was one of the most conspicuous ultra-royalists during the Restoration era. At the time, it was rumoured that Polignac supported ultra-royalist policies because he thought he was receiving inspiration from the Virgin Mary. There is little historical evidence for this story, however. There is no mention of such motivation in Polignac's personal memoirs or in the memoirs of