In 1386, marriage negotiations between her and a son of Albert II, Duke of Austria begun,[1][2] with her dowry Feltre and Cividale de Belluna. The marriage never materialized however as Gian Galeazzo Visconti, Lord of Milan paid bribes to not make the betrothal go through.
Gigliolas father owing a debt of 10.000 ducats to Gian Galeazzo was proposed if he would marry his daughter to Gian Galeazzos illegitimate son Gabriele Visconti, the lord of Vincenza and Verona.[2]
Visconti was most likely hoping to help strengthen his son's claims to the cities; since Gigliola through her maternal grandmother Verde della Scala she was a descendant of Mastino II della Scala who had once been lord of Vincenza and Verona. Gian Galeazzo also promised to marry Gigliolas oldest brother Francesco to a daughter of his cousin Alvise Visconti[1]
The last legitimate heir, Canfrancescohad died mysteriously in 1392 (most likely poisoned)
Gigliolas father distrustful of Gian Galeazzos promises,[1] betrothed her instead to her cousin Niccolò III d'Este, son of Alberto V d'Este (and enemy of Gian Galeazzo[1])
Her husband was frequently unfaithful to her and fathered many illegitimate children.[4]
After the Battle of Casalecchio in 1402, her brother Francesco Giacomowho were captured by enemy forces and was being taken to Pavia and Gian Galeazzo Visconti. Francesco managed to escape to the territory of his brother-in-law and husband to Gigliola. She supplied him with a horse and guards to get him home safely to Padua.[1]
In 1405 her father and two brothers were executed by Venetian officials after their capture during the War of Padua.
