Gerolamo Olgiati (1453 โ 2 January 1477) was a government official in Milan and one of the assassins of Galeazzo Maria Sforza, the Duke of Milan, along with Giovanni Andrea Lampugnani and Carlo Visconti. Olgiati was the political radical of the conspiracy, bearing no known grudge against the Duke, but rather acting out of Republican ideals. He claimed in a subsequent confession that many of ideas were the product of studying under a Humanist educator who had first suggested the assassination.