A US dealer says he is owed millions by insurance brokers for 12 works that were confiscated by authorities from the Palazzo Ducale in 2017 as suspected fakes

French expert Marc Restellini claims substantial modifications to Italian painter's 1915 portrait of Beatrice Hastings were not mentioned by Christie's when the picture was sold—twice

Institute is claiming copyright ownership and right to publish expert’s research, alongside share of profits from Institut Restellini which it claims charges €30,000 per inquiry

Exhibition at the Albertina Museum in 2020 will “reposition” artist as an avant-garde innovator, organiser says