However, the Monarchy of the UK is probably all very well known to you at this point
The real interesting things happened in America. Some very famous Monarchs of America include the two Iconic Queens in its history
Queen Mary ushered in a new era in American Monarchy and began the tradition of Monarchial Neutrality in Domestic Political Affairs in contrast to her older brother. Her reign is referred to as the Marian era where America's global influence expanded dramatically.
Queen Mary the second is a symbol of monarchial modernisation. Her eign saw the monarchy become more in touch with the people. She demanded to shorten her incredibly long full title to represent this modernisation. She attended public outings and had a lot of communication with everyday people. She was immensely popular during her reign.
However, the most infamous member of the royal family is to be equally noted. While Mary herself modernised her son and heir apparent raised his children under old monarchial ways. This lead to the tragic life of George II's Eldest Daughter Violet.
Violet was never expected to be a queen, at birth she was 3rd in line to the throne behind her older brother and father. However, she was still subject to strict rules. She had a bad relationship with her father and a very rocky one with the Queen. When stories of her sneaking out of her private school to go to friends houses during the day broke the royal family was furious at her behaviour. the extra watch placed over Violet ended up nit working as true scandal would break when it was revealed that she was pregnant at 15 with her secret boyfriend's baby. Attempts to cover up the scandal failed dramatically with the media hounding the young princess. Her Daughter, Lucy, was born early 1970 being the Duke of New York's first Grandchildand the Queen's first Great-Grandchild. Lucy would not be in line to the throne as she was a bastard. All hopes of ending the scandal by marrying her high school boyfriend to legitimise Lucy were foiled when Steven Hammond was arrested for drug possession. He admitted to using Illegal Drugs with the Princess which ended up destroying her reputation.
Princess Violets Adulthood consisted of doing her standard courtship as all royal children had to do at the age of 18-25. Her father picked heir to a Sonora Oil Fortune Robert Darfield and Violet was married at 19 [Very common for Royal daughters]. Her marriage was extremely unhappy from the start and Violet pleaded with her Grandmother to annul the marriage or allow a divorce. Queen Mary was more sympathetic to her Granddaughter than her father so she allowed a divorce which lead to more scandal.
Her conflicts with members of her family lead Violet to severe use of Drugs and Alcohol which would deteriorate her health dramatically. While attending a house party with an old friend in Motreal she accidentally overdosed on cocaine. She was immediately brought to the Montreal Royal Hospital but attempts to save her were a failure. Princess Violet died at age 27 in 1981.
Her death prompted a change in how the royal family operated. Courtship was not forced on later daughters of the house of Columbia. The first example of this was with her cousin Lillian who was the first in history to not be subject to the young courtships forcefully and ended up marrying much later than usual. The public viewed princess Violet more negatively at the time of her death but over time she has become more liked as people understand the circumstances of her death better.