Bonacossa Borri
Lady of Milan
About Bonacossa Borri
Lived 1254 – 1321 (aged 66–67).
Bonacossa Borri, also known as Bonaca, Bonacorsa, Buonacosa, Bonaccossi, and Bonacosta (1254–1321), was Lady of Milan by marriage from 1269 to 1321.
Biography
Bonacossa was the daughter of Squarcina Borri (1230–1277, also called Scarsini), captain of exiles from Milan from the advent of the Torriani family, and a loyal supporter of the Visconti, and Antonia (1236–?), daughter of Guglielmo I de Suavis, who married in 1254. Borri's family was originally from the town of Santo Stefano Ticino, together with some feudal lands of nearby Corby. The Borri family was one of the most respected of Milan, and counted among its ranks a saint, Monas of Milan, Bishop of Milan.
Once the Visconti had conquered Milan, Squarcina Borri gave his daughter in marriage to Matteo I Visconti, Lord of Milan in 1269 to cement those bonds essential to maintaining the rule of the Visconti. Bonacossa was Matteo I Visconti's second wife, and they had many children together.
Bonacossa and her husband co-founded the chapel of St. Thomas in the Basilica of Sant'Eustorgio of Milan, where they were buried, along with their son Stefano and his two daughters Beatrice and Catherine, and the brother of Matteo, Uberto III Visconti.
She died in Milan on 13 January 1321.
Descendants Galeazzo I Lord of Milan. He married Beatrice d'Este Beatrice (b. 1280), married Spinetta Malaspina of Verucola Caterina (b. 1282 – d. 1311), married Alboino della Scala Luchino (b. 1285) Lord of Milan, married Violente di Saluzzo Stefano (b. 1287) Count of Arona, married Valentina Doria Marco (b. 1289) Giovanni (b. 1291), Archbishop of Milan Zaccaria (b. 1295), married Otto Rusconi Floramonda, married Guido Mandelli, count of Maccagno Agnese, married Cecchino della Scala
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Important facts
People in Bonacossa Borri's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Bonacossa Borri's
Frequently asked questions
Who was Bonacossa Borri?
Lady of Milan
When was Bonacossa Borri born?
Bonacossa Borri was born in 1254 in Milan.
When did Bonacossa Borri die?
Bonacossa Borri died on 13 January 1321 in Milan.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Bonacossa Borri. https://biography.guide/bonacossa-borri/
MLA: "Bonacossa Borri." Biography.guide, https://biography.guide/bonacossa-borri/.
Chicago: "Bonacossa Borri." Biography.guide. https://biography.guide/bonacossa-borri/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
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