Even if you have never heard the name Giovanni Benedetto Castiglione (1609-1664) – and admittedly there are many of us that haven’t – the title ‘Lost Genius’ given to the exhibition curated by the Queens Gallery[i] now travelling to the Denver Art Museum may raise a few questions. How can one lose a genius? It is up to the British Royal Collection to answer that since they did indeed. Castiglione’s work was never physically lost, his drawings never stolen, or misplaced, he merely got forgotten. It was King George III who purchased a large share of the Genoese artist’s works, close to 100 drawings, etchings, and monotypes, estimated to be…