Estorre, who is also known as Ettore or Astorre[1] was born in 1346 in Milan, son of Bernabò Vidsconti and Beltramola de' Grassi.
Estorre was born while his father lived in exile until Bernabo was called back to Milan by his uncle Giovanni Visconti sometime around 1347-1349.
Sometime around 1403, Estorre was in the city of Verona, where his half-brother Carlo Visconti ruled[4] after being forced into exile by their cousin Gian Galeazzo who had usurped the title of lord of Milan from their father, Bernabò.
Estorre, his sister Valentina and her husband Giovanni Aliprandi, then fled to Monza where he was besieged by the Count of Carmagnola.
Here, in the courtyard of the castle, while he was watering his horse, a stone thrown at random from a catapult of the besiegers broke his leg, which eventually caused his death in Monza a few days later.