France’s luxury-goods tycoons are among the country’s wealthiest individuals and companies to pledge at least 400 million euros ($452 million) to help in the reconstruction of Notre-Dame cathedral a day after the Paris landmark was ravaged by fire.

Kicking off a wave of donations in response to a call from President Emmanuel Macron for a fund-raising campaign, Francois-Henri Pinault, the chairman and chief executive officer of Gucci owner Kering SA, and his father, Francois Pinault, said Tuesday they would donate 100 million euros from their Artemis investment company.

Their archrival, the Arnault family, responded minutes later with a pledge of 200 million euros and the architectural and design resources of their LVMH fashion conglomerate.

It’s unclear how much it will cost to repair the cathedral.