3 September 2026
LONDON — She climbed the steps of Caxton Hall register office on the morning of May 6th, 1944, wearing a suit instead of a gown, carrying a small bouquet, and missing almost everyone who shared her blood. Kathleen “Kick” Kennedy, the fourth child of America’s most ambitious Irish Catholic dynasty, was about to marry the future Duke of Devonshire, heir to one of England’s oldest and most storied titles. Her mother was 3,000 miles away in Massachusetts, refusing to acknowledge the date on a calendar. Her father had cabled his disapproval and stayed in America. Of her eight brothers and sisters, only one had come, her eldest brother, Joseph Jr. , a naval officer who had pulled rank on his own leave to stand beside her in uniform as the only Kennedy witness to the marriage of a Kennedy daughter. Outside, London was a city rationed down to its bones, blacked out at night, waiting for an invasion of France that everyone knew was coming but no one was allowed to say when. Inside the register office, a girl from Boston was marrying into a family that had spent four centuries building precisely the kind of inherited power the Kennedys, for all their new American money, did not yet have and quietly longed for. This was the story of a girl raised inside the strictest version of her mother’s Catholic faith, who fell in love with a Protestant Marquis, then a second time with a Protestant Earl, and who discovered two times over that the cost of following her own heart was not measured only in argument or tears, but in absence, in the specific irreversible absence of a mother who would not come to her funeral, either. Kathleen Agnes Kennedy was born on February 20th, 1920, in Brookline, Massachusetts, the fourth child and second daughter of Joseph P. Kennedy and Rose Fitzgerald Kennedy. By the time she arrived, her parents already understood, in the particular American way of a rising Irish Catholic family, that their children were not simply children. They were a project. Joseph Kennedy was a man building a fortune that would eventually touch banking, film, and liquor importation, a man who would go on to chair the Securities and Exchange Commission and serve as ambassador to the Court of St. James’s. Rose was the daughter of John “Honey Fitz” Fitzgerald, a former mayor of Boston, and she had grown up inside political life the way other children grow up inside a family business. Between them, they would have nine children in all, and they would raise every one of them, daughters included, to believe that competing and winning was simply what a Kennedy did, in tennis, in sailing, in conversation at the dinner table, in life. The house Kick was raised in was not a single house but a sequence of them, a home in Brookline, then a larger one in Bronxville, New York, and every summer the long white clapboard cottage at Hyannis Port on Cape Cod that would become, more than any other address, the place the family thought of as home. It had 15 rooms, a view of Nantucket Sound, and eventually a sailboat for nearly every child old enough to hold a tiller. Joseph Kennedy provided for his family with a thoroughness that left little material want, even as his frequent absences for business in New York, in California, in London left a different kind of want that no income could fill. Rose, devoutly Catholic, attended mass with a regularity her own daughter would later describe as something closer to a discipline than a habit. She raised her children inside a faith that did not bend, that drew firm lines around what was permitted and what was a sin serious enough, in her own words, to risk a soul’s damnation. Kick herself was something different from the start, not rebellious in any dramatic door-slamming sense, but irrepressible, the way a current is irrepressible. Her own nickname, the one that replaced Kathleen’s so completely that even strangers used it, came from that high-spirited quality, the sense that she moved through a room the way a small jolt of electricity moves through a wire. She attended the private Riverdale Country School, then the stricter, more devout Noroton Convent of the Sacred Heart in Connecticut, the kind of education designed to produce exactly the sort of Catholic daughter Rose intended to raise. It did not entirely take. Kick was popular with boys in a way that worried her mother, charming in a way that disarmed nuns, and possessed of a wit that her own brothers, among them a future president, found sharper than their own. She was, in the words of one biographer who would later study her, the only one of the nine Kennedy children who did not march down the prescribed road. Throughout her life, the people who knew Kick best would describe not a single object so much as a single motion, the particular irreverent ease with which she could walk into a room full of Dukes and Earls and instantly make herself at home, chewing gum on a London street where she was meant to be curtsying, calling the Duke of Marlborough “Dukie Wookie” to his face. In 1938, that fearlessness was given a stage. Joseph Kennedy was appointed United States Ambassador to the United Kingdom, and the family crossed the Atlantic into a world built entirely on the rules Kick had spent her childhood almost but not quite obeying. She was 18. She made her formal entrance as a debutante that May, was presented at Queen Charlotte’s Ball, and was within a season declared by the English press the debutante of the year. She studied at Queen’s College in London, and she built a circle of friends that crossed every line her mother might have wished to keep intact, friends who were Protestant, friends who were aristocratic, friends whose families had spent four centuries building precisely the kind of inherited power that the Kennedys did not yet have. It was supposed to be a temporary posting, two years at most, a credential on the way to something larger for her father. Instead, for Kick, it would turn out to be the place she gave her heart to twice and the place she would eventually be buried. Among the friends she made that first English season was a young man named William Cavendish, known to nearly everyone as Billy Hartington, the Marquess of Hartington, eldest son and heir apparent to the 10th Duke of Devonshire, heir in turn to Chatsworth House, one of the largest and most storied private estates in England, and to a dukedom that stretched back through nearly five centuries of English history. Where Kick was quick, voluble, and instinctively warm to strangers, Billy was reserved almost to the point of shyness, slow to speak, careful with his opinions, a young man more at ease with a book or a quiet conversation than with the kind of room Kick could fill simply by walking into it. He had grown up inside a family that was, by reputation, one of the most politically prominent and most vocally anti-Catholic in England. The Cavendishes had for generations been associated with a Whig and later Liberal and Unionist political tradition deeply suspicious of Catholic influence in English public life. It was, on paper, about as unlikely a match as London could have produced, the Catholic ambassador’s daughter from Boston and the Protestant heir to a dukedom whose family had spent 200 years arguing against exactly the kind of Catholic emancipation that had made her own grandfather’s career possible in Boston. None of that pedigree stopped the two of them from talking. They met, as so many of that era’s English friendships began, at the ordinary social machinery of the season, parties, dances, the slow circulation of young people through country house weekends. And what began as friendship between two 18- and 20-year-olds deepened in the months that followed into something neither of them had quite been looking for. They talked late into the night whenever they were in the same house, the way people do when they have found, almost by accident, the one person in the room who does not require performance. Billy was unlike anyone Kick had grown up around, unhurried where her brothers were competitive, certain in a quiet way rather than a loud one. And it was precisely that contrast, friends would later say, that drew her to him. Here already is the cost the story will eventually ask her to pay. A Marquess in line for an English dukedom does not simply marry where he chooses. He marries by the unspoken law of his class and his church, a Protestant Englishwoman of suitable family, and he raises Protestant children who will one day inherit not just a title but a particular and very old idea of what an English ducal family is supposed to be. Falling for Billy Hartington meant falling toward a wall that neither of them had built but that both of them would eventually have to climb, or refuse to climb, or be broken against. The wall broke the timeline before either of them had to decide anything. In September of 1939, with Britain newly at war with Germany, the Kennedy family returned to the United States, Kick included, summoned home by a father who did not intend to let his children remain in a country under blackout and bombardment. For nearly four years, the romance that had begun in London continued at the distance of an ocean and a war, sustained by letters, by the occasional leave, by whatever Kick could learn second-hand of a young man now serving as a member of Parliament for West Derbyshire, elected, remarkably, while still in his early 20s and increasingly drawn toward active military service himself. Kick, restless in America, eventually found her own way back across the Atlantic in 1943, taking a position with the American Red Cross in London, in part, her friends understood perfectly well, because it was the only respectable way for an unmarried Catholic ambassador’s daughter to return to the one country and the one man she had never stopped thinking about.…
