Authentication on photograph by Enrico Mascelloni, 2024; the artwork will be included in the Catalogue Raisonné in preparation
Exhibitions: 1986, Cagli e Leoncillo alle ceramiche Rometti di Umbertide, 13th September - 30th November 1986, Rocca di Umbertide, Umbertide, curated by Cortenova G. e Mascelloni E.;
2023-2024 / Leoncillo. Sequenze (1932-1968), 14th December 2023 - 15th February 2024, Capitolium Art Gallery, Rome, a cura di Mascelloni E.