This 15th century royal peculiar - a church under the direct jurisdiction of the monarch - echoed to the sounds of a fiery Chicago preacher, a soulful gospel choir and the first black victor of a prestigious British music prize, as a constellation of A-list Americans rubbed shoulders with the bluest-blooded of British royalty. That means that Markle will become the Duchess of Sussex when she says "I will". There will be so much shouting and cheering and noise. "I wish that Diana was here, but she's in heaven watching over them".
The British weather was - gasp! - sunny and balmy, bathing the ancient stones of Windsor Castle in a attractive spring light. Security was tight and visitors had to pass through police search points set up around the castle, home to 39 English monarchs since 1066.
To some black Britons, the wedding is a fairytale which personifies the breakdown of barriers and reveals a more modern Britain where a person's background is no obstacle to even the most elite and traditional of institutions.
The hour-long ceremony begins at 1100 GMT.
Harry and best man Prince William wore white gloves and the frock coat uniforms of the Blues and Royals army regiment, in which Harry was once an officer.
Markle will enter the chapel unescorted.
Guests from Markle's side included her mother, Doria Ragland, who watched with tears in her eyes as her daughter walked down the aisle.
Meghan's dad, Thomas Markle, tells TMZ, "My baby looks attractive and she looks very happy". "African-Americans were front and center at the royal wedding".
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The son of British royalty and the daughter of middle-class Americans Wednesday Saturday in a service that reflected Prince Harry's royal heritage, Meghan Markle's biracial roots and the pair's shared commitment to putting a more diverse, modern face on the monarchy.
Also present were cast members from "Suits" - the legal drama in which she made her name - including Abigail Spencer, Sarah Rafferty, Gina Torres and Gabriel Macht. A black USA bishop, Most Reverend Michael Bruce Curry, will give the wedding address.
Cheers rang out across every crowd-lined street and every pub in Windsor as Prince Harry said "I will", when asked if he would love, honour and protect his bride. Senior male British royals do not traditionally wear rings.
A gospel choir then sang the Ben E King soul classic "Stand By Me".
The carriage ride followed a lavish ceremony at St George's Chapel in Windsor Castle in which the couple were married by the Archbishop of Canterbury Justin Welby.
They are not immediately embarking on a honeymoon and have their first royal engagement as wife and husband scheduled at Buckingham Palace Tuesday. "I think this woman, at the moment there is a lot of passion, I think this will continue", Morgan, who famously worked with the late Princess Diana for almost five years, said during an appearance on Loose Women, according to The Sun.
Last year, he spoke openly of his emotional torment following the 1997 death of his mother in a Paris auto crash.
His easy-going manner with the public is reminiscent of Diana, and he has picked up her campaigning baton with work on the welfare of military veterans, helping those with AIDS, and mental health issues.