Emmanuel Macron was inaugurated Sunday as France’s new president at the Elysée Palace in Paris, and immediately launched into his mission to shake up French politics, world economics and the European Union.

The 39-year-old Macron is the youngest president in the country’s history and the eighth president of France’s Fifth Republic, which was created in 1958. A former economy minister with pro-business, pro-European views, Macron is the first French president who doesn’t originate from one of the country’s two mainstream parties.

After Macron was formally declared president, 21 cannon shots were fired from across the Seine River at the Invalides monument, where Napoleon is entombed.

Macron later solemnly paid tribute at the Tomb of the Unknown Soldier beneath the Arc de Triomphe, greeting veterans and military officers in formation beneath the imposing arch.

Macron takes charge of a nation that, when Britain leaves the European Union in 2019, will become the EU’s only member with nuclear weapons and a permanent seat on the UN Security Council.

Before the ceremony, he met for an hour with his predecessor, François Hollande, taking a last few minutes to discuss the most sensitive issues facing France, including the country’s nuclear codes.

In a visibly moving moment for both, Macron accompanied Hollande to his car, shaking hands and applauding him along with the employees of the French presidency who had gathered in the palace’s courtyard.

French President-elect Emmanuel Macron, right, shakes hands with outgoing President François Hollande before the handover ceremony in Paris on Sunday. (Christophe Ena/Associated Press)

The two men had known each other well. Macron was Hollande’s former adviser, then his economy minister from 2014 to 2016, when Macron quit the Socialist government to launch his own independent presidential bid.

In his inauguration speech Sunday, Macron said he will do everything necessary to fight terrorism and authoritarianism and to resolve the world’s migration crisis. He also listed “the excesses of capitalism in the world” and climate change among his future challenges.

“We will take all our responsibilities to provide, every time it’s needed, a relevant response to big contemporary crises,” he said.

Macron announced his determination to push ahead with reforms to free up France’s economy and pledged to press for a “more efficient, more democratic” EU. France is a founding member of the 28-nation bloc and its third-largest economy after Germany and Britain.

About 300 guests, officials and family members gathered in the Elysée reception hall, including Macron’s wife, Brigitte, wearing a lavender blue dress by French designer Nicolas Ghesquiere for Louis Vuitton.

Macron himself wore a dark suit from French brand Jonas and Cie, a tailor based in Paris.

The new president arrived on the Champs-Elysées Avenue under a heavy rain — recalling Hollande’s inauguration five years ago — but unlike his predecessor, Macron managed to avoid getting wet. The bad weather often associated with the former Socialist president has become a joke for the French.

Macron’s wife, Brigitte, greets Lyon Mayor Gerard Collomb during the presidential inauguration on Sunday. (Francois Mori/Pool/Associated Press)

After his time at the tomb, Macron went to shake hands with supporters along the Champs-Elysées, who were taking selfies and waving French tricolour flags, before coming back to the palace for a lunch with his family.

Earlier, he and France’s new first lady briefly posed for photographers at the front porch of the palace after Hollande left. The couple will now live at the Elysée Palace.

Macron will meet with Paris Mayor Anne Hidalgo later Sunday and will take his first trip abroad Monday to Germany to visit Chancellor Angela Merkel in Berlin.

Macron will also have to name his prime minister and form a government in the next few days.

He has promised to reinvigorate French politics by bringing in new faces. His En Marche! movement has announced an initial list of 428 candidates for the 577 seats up for grabs in France’s lower house of parliament in a vote in June, running under the name La République En Marche!. Macron is seeking to elect a majority of lawmakers so he can pass his programs.

Many of the candidates are newcomers in politics. Their average age is 46, compared to 60 for the outgoing assembly. Half of them are women. Only 24 are lawmakers running for re-election, all Socialists.

Hollande, meanwhile, went on Twitter to describe the “terrible ordeals” that marked his five-year term, from deadly attacks to Greece’s debt crisis. He defended his unpopular presidency in a series of tweets minutes after leaving the Elysée Palace.

Nous avons vécu des crises et là encore nous avons tenons bon. La France est restée la France

—
@fhollande

Hollande noted his accomplishments in getting the Paris Agreement on climate change, legalizing gay marriage and doing “everything possible to ensure that Greece stays in Europe.”

“We lived through crises but we held together. France remained France,” he tweeted.