Queen Elizabeth II conferred the title of Duke and Duchess of Sussex upon the newly-wed couple.
Britain's Prince Harry and US TV star Meghan Markle tied the knot at the St George Chapel on Saturday as the whole world watched on.
The Archbishop of Canterbury Justin Welby, who performed wedding ceremony, said the couple were “very sensible” and “self-possessed”.
“There's profound affection between them which is wonderful and a deep understanding and mutual support,” he said.
The couple met on a blind date in July 2016 and had a whirlwind romance, criss-crossing the Atlantic as she continued filming in Toronto.
Prince Harry, the youngest son of the late Princess Diana, is one of the most popular royals, while Markle, a divorcee, is seen as a breath of fresh air for the monarchy.