King Charles III’s coronation on Saturday marks the beginning of a new era for the British royal family. Since the coronation of his mother, Queen Elizabeth II, 70 years ago, there have been modifications to the pomp, spectacle, and symbolism that have been there for more than a thousand years. These changes will also be present for the coronation of this new monarch.

Plans for the ceremony at Westminster Abbey call for a more toned-down affair than the last one, even though royals from other nations, heads of state and most of Charles’ family will be there, and the monarch plans to wear the same vestments as Elizabeth did. Here are some things to know about the coronation: WHY HAVE THE CORONATION IF CHARLES IS ALREADY KING? Charles automatically ascended to the throne when Elizabeth died Sept. 8, and he was officially proclaimed Britain’s monarch two days later in an ascension ceremony broadcast for the first time on television. Charles said he was “deeply aware of this great inheritance and of the duties and heavy responsibilities of sovereignty which have now passed to me.” There is no legal requirement for a coronation, and other European monarchies have done away with the ceremonies.

But the deeply religious and regalia-heavy event is a more formal confirmation of his role as head of state and titular head of the Church of England and was intended to show the king’s authority was derived from God. During the service conducted by the church’s spiritual leader, the archbishop of Canterbury, Charles will be anointed with oil, receive the traditional symbols of the monarch — including the orb and scepter — and have the St. Edwards Crown placed on his head for the first time. Charles’ wife, Camilla, will be crowned as queen consort. WHAT WILL BE DIFFERENT FROM THE LAST CORONATION? The coronation ceremony dates back to the medieval period, and much of it remains unchanged. Westminster Abbey has been the setting of the ritual since William the Conqueror was crowned in 1066.

Elizabeth II’s coronation in June 1953 was the first to be televised live. It drew an audience of tens of millions in Britain and was later played to a worldwide audience. In the age of streaming and social media, people will be able to watch Charles’ crowning live from virtually anywhere on the planet and post their hot takes with a crown emoji created for the occasion. Charles has said he plans to slim down the monarchy. His coronation is expected to reflect that with a ceremony shorter than his mother’s three-hour extravaganza and 2,000 guests in the audience — a quarter the number who assembled to see Elizabeth crowned. In a nod to the change in the religious makeup of the United Kingdom, Buddhist, Hindu, Jewish, Muslim and Sikh religious leaders will play a role at the coronation. That reflects Charles’ vow to be “the defender of faiths,” as opposed to the “defender of the faith.”

His younger brother, Prince Harry, the disgruntled Duke of Sussex, is not expected to take part in the service. His explosive memoir “Spare,” which became a bestseller early this year, made unflattering claims about the royal family. Until three weeks ago, there was a question of whether Harry and his wife, Meghan, would attend the crowning after leveling charges of racism and media manipulation at the royal family. While Harry will be there, the duchess is to remain at the couple’s Southern California home with their two young children, Prince Archie and Princess Lilibet. The coronation is just a few days before the first of Harry’s lawsuits against the British tabloid press goes to trial. The case could reveal more family secrets. During a hearing in a similar case last week, Harry said in court papers that Buckingham Palace, with the approval of the queen, had an agreement with Rupert Murdoch’s English newspapers to settle phone hacking allegations without a lawsuit. Harry said he was directed by palace staff to drop his litigation because his father wanted to curry favor with the press. The family drama doesn’t end there. Charles’ brother, Prince Andrew, is also not expected to play any role in the ceremony. Andrew gave up royal duties and was stripped of military titles and patronages after revelations of his friendship with convicted sex offender Jeffrey Epstein. Andrew settled a lawsuit with a woman who said she was forced to have sex with him when she was a teenager. WHAT IS THE IMPORTANCE OF THE CORONATION? With opinion polls showing support for the monarchy has weakened in recent years, this is the chance for Charles to seek and showcase the public’s embrace. Crowds are expected to line the streets to cheer the new king, and throngs will stand outside Buckingham Palace waiting for him to appear on the balcony after the procession.