After three generations of genteel discretion bordering on secrecy, the international banking family the Rothschilds has been riven by rival claims to a vast collection of masterpieces that are part of the family’s multibillion-euro fortune.

The battle now playing out in the courts and media has pitched the 93-year-old senior baroness, Nadine de Rothschild – widow of Edmond de Rothschild, the late scion of the French-Swiss branch of the family – against her daughter-in-law, Ariane de Rothschild, the current baroness.