"Caterina Visconti (1361 – 17 October 1404) was Duchess of Milan as the second spouse of Gian Galeazzo Visconti, the first Duke of Milan, and was the mother of two succeeding Dukes of Milan, Gian Maria and Filippo Maria Visconti. Caterina served as Regent of Milan from 1402 to 1404, during her elder son´s minority, but due to Gian Maria´s suspicion of her alleged treason (planted in his mind by her enemy, the condottiero Facino Cane), he had his mother arrested and imprisoned in the castle of Monza, where she was presumably poisoned in 1404." - (en.wikipedia.org 18.11.2019)
en
