Joanna Visconti (died 1339) was the titular Judge (Giudicessa) of Gallura from 1298. She was the daughter of Ugolino Visconti and Beatrice, daughter of Obizzo II d'Este

Obizzo II d'Este

Obizzo II d'Este was Marquis of Ferrara and the March of Ancona.-Biography:He was a bastard, the fruit of an illegitimate relation of Rinaldo I d'Este - the only son and heir of the Margrave Azzo VII d'Este - with a Neapolitan laundress...

. She succeeded her father when she was a baby, though he had already been deprived of Gallura by the Republic of Pisa

Republic of Pisa

The Republic of Pisa was a de facto independent state centered on the Tuscan city of Pisa during the late tenth and eleventh centuries. It rose to become an economic powerhouse, a commercial center whose merchants dominated Mediterranean and Italian trade for a century before being surpassed and...

 at the time and her succession was purely nominal.

She claimed her rights in Sardinia to no avail and eventually sold them to her relatives, the Visconti

House of Visconti

Visconti is the family name of two important Italian noble dynasties of the Middle Ages. There are two distinct Visconti families: The first one in the Republic of Pisa in the mid twelfth century who achieved prominence first in Pisa, then in Sardinia where they became rulers of Gallura...

 of 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 ,...

, who later sold them to the Crown of Aragon

Crown of Aragon

The Crown of Aragon Corona d'Aragón Corona d'Aragó Corona Aragonum controlling a large portion of the present-day eastern Spain and southeastern France, as well as some of the major islands and mainland possessions stretching across the Mediterranean as far as Greece...

. On 13 November 1309, she married Rizzardo da Camino, Count of Ceneda and Lord of Treviso

Treviso

Treviso is a city and comune in Veneto, northern Italy. It is the capital of the province of Treviso and the municipality has 82,854 inhabitants : some 3,000 live within the Venetian walls or in the historical and monumental center, some 80,000 live in the urban center proper, while the city...

. In 1328, she was granted a pension by the Guelphs.

She is mentioned passingly by Dante Alighieri

Dante Alighieri

Durante degli Alighieri, mononymously referred to as Dante , was an Italian poet, prose writer, literary theorist, moral philosopher, and political thinker. He is best known for the monumental epic poem La commedia, later named La divina commedia ...

 in Purgatorio

Purgatorio

Purgatorio is the second part of Dante's Divine Comedy, following the Inferno, and preceding the Paradiso. The poem was written in the early 14th century. It is an allegory telling of the climb of Dante up the Mount of Purgatory, guided by the Roman poet Virgil...

Canto VIII:46–84, where her father, a friend of Dante's, but consigned to Purgatory with the other negligent rulers, asks her to be reminded of him.