Step 1 : Introduction to the question "After marrying Prince Harry, Meghan Markle became the Duchess of what?"
...After marrying Prince Harry at St. George’s Chapel in 2018, Meghan Markle became an official member of the royal family. Meghan Markle is now the Duchess of Sussex. She is the first woman to be known as the Duchess of Sussex. Prince Harry is the second Duke of Sussex. Prince Augustus was the only other person to hold the title. After marrying Prince Harry, Markle can now use Mountbatten-Windsor as her surname. However, considering royals tend to be known only by their first names, it’s not likely you’ll see her addressed by that name very often.