Guglielmo della Scala was the son of Cangrande II della Scala

Cangrande II della Scala

Cangrande II della Scala was Lord of Verona from 1351 until his death.In 1351, after the death of his father Mastino II della Scala, he inherited the lordship of Verona and Vicenza, initially under the regency of his uncle Antonio...

. He assassinated his father in 1359, but was edged out of power by his uncle Cansignorio

Cansignorio della Scala

Cansignorio della Scala was Lord of Verona from 1359 until 1375, initially together with his brother Paolo Alboino.-Biography:...

.

In 1404, together with his two sons Brunoro and Antonio II, he led a revolt against the Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

ese. He was proclaimed Lord of Verona on 17 April, but was expelled from the city by the populace on 28 April. Francesco da Carrara, Lord of Padua, took over in the city a few days later.

By his marriage to Onesta Mortone, Guglielmo left the two aforementioned sons, who never regained power in Verona, and three younger sons: Bartolomeo (died 21 March 1453), Fregnano (died 4 December 1443 at Vienna

Vienna

Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...

), Nicodemus, and Paul.