Eli Countryman Princess Diana (Emma Corrin) and Prince Charles (Josh O’Connor) take center stage in “The Crown” Season 4 trailer, which also offers first footage of Gillian Anderson in the role of Margaret Thatcher.“Here is the stuff of which fairy tales are made — a prince and princess on their wedding day. But fairy tales usually end at this point, with the simple phrase, ‘They lived happily ever after,'” the trailer’s narration says.