This guy seems to be the world champion of hustlers. He's a French writer and photographer who befriended the richest woman in the world, Liliane Bettencourt of L'Oreal, and got gifts with a combined worth of €1.3 billions out of her over time. Her daughter later sued him for "abuse of weakness".
When he was 16, Salvador Dalí, "would send his car to bring Banier to his suite at the Hotel Meurice to discuss art". 🧐
He befriended another rich old heiress at 19, and worked as media spokesman for Pierre Cardin at 20. A few years later he was dating the then 70-something Louis Aragon, who had just come out as bisexual after the death of his wife.
He's Lily-Rose Depp's godfather, and appears to have been in some kind of throuple with French actor Pascal Greggory and the latter's nephew (?!)