This week, the U.K. is celebrating Queen Elizabeth II’s Platinum Jubilee, marking 70 years on the throne. She rose to the throne in 1952 at the age of 25 upon the death of her father King George VI. Per TIME’s Feb. 18, 1952, story on the transition of power, “as British officers, for the first time in 51 years, directed their wardroom and regimental toasts ‘to the Queen’ instead of ‘to the King,’ Britons felt in their bones that Elizabeth will be good for them.” In her honor, there will be numerous celebrations and a four-day bank holiday from June 2 to June 5. [time-brightcove not-tgx=”true”] “She’s become the longest-reigning monarch in British and Commonwealth history,” as Carolyn Harris, historian and author of Raising Royalty: 1000 Years of Royal Parenting, puts this milestone in context.