Question: Who claims to have descended from the COuntess Mathilde of Canossa?
About the article "Michelangelo", section "Early life, 1475-88".

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Today, "Canossa" refers to an act of penance or submission.
To "go to Canossa" is an expression – used often in German: "nach Canossa gehen", in Dutch: "naar Canossa gaan", in Danish, Norwegian and Swedish: "Canossavandring" or "Kanossagang", in French: "aller à Canossa", in Hungarian: "kanosszajárás", in Italian: "andare a Canossa", and in Slovenian: "pot v Canosso" – to describe doing penance, often with the connotation that it is unwilling or coerced.
Adolf Hitler, for instance, used the expression to describe his meetings with Bavarian Minister President Heinrich Held after being released from Landsberg Prison, in his bid to have the ban on the Nazi Party lifted.
The expression was prominently used again in 2007 by Mandriva CEO Francois Bancilhon when announcing that company's position regarding Microsoft's software patent deals with other GNU/Linux distribution companies such as Novell, Linspire and Xandros. 
Luigi di Canossa SJ (April 20, 1809 – March 12, 1900) was an Italian Cardinal of the Roman Catholic Church who served as Bishop of Verona from 1861 until his death, and was elevated to the cardinalate in 1877. 
1940), Queen of Denmark, 1972–Present Marguerite de Navarre, Duchess of Berry, 1517–1549, Duchess of Alençon & Countess of Perche, 1525–1549?
Marguerite of Alençon (1503–?
), Lady of Verneuil, Poissy, Vernouillet and Meulan Marguerite of Nesle (1300–1350), Lady of Catheu, 1334–1350 Marguerite of Valois, Countess of Auvergne, 1608–1610, Duchess of Étampes, 1582–1598 Marguerite Charlotte of Piney-Luxembourg, Countess of Ligny & Duchess of Piney-Luxemburg, 1616–80 Maria de Urgell (d. 1196), Señora de Almenara Maria dalle Carceri (d. 1323), Heiress of 1/6 of Euboea as the daughter of Gaetano dalle Carceri; Marquise (1/2) of Bodonitsa, 1311–1358, as the widow of Albert Pallavicini.
She shared Bodonitsa with their daughter, Guglielma.
Maria of Antioch-Armenia, Lady of Toron, 1229–1266 Maria of Cleves (1553–?
), Duchess of Cleves Maria of Hornes (d. 1434), Countess of Hornes, Lady of Duffel and Waelheim Mary, Queen of Hungary (1371–95), Queen of Croatia, 1382–1395, Queen of Hungary, 1382–1395 Maria of Jever, Lady of Jever, 1511–1575 Maria of Molina, Lady of Molina, 1293?–1322?
Maria of Montferrat, Queen of Jerusalem, 1205 Maria I of Portugal (1734–1816), Queen of Portugal, 1777–1816 Maria of Randerath (d. 1395), Lady of Randerath Maria of Vianden (c. 1337–1400), Countess of Vianden Maria Albina of Hauteville (d. after 1205), Countess of Lecce Maria Angelina Ducena Palaeologina, Ruler of Epirus, 1385–1386 Marie Antoinette (1755–1793), Archduchess of Austria, Dauphine of France, 1770–1774, Queen of France and Navarre, 1774–1792 Maria Beatrice Ricciarda (1650–1729), Sovereign Duchess of Massa, Sovereign Princess of Carrara, 1790–1797, 1814–1829, 7th Duchess of Ajello, Baroness of Paduli and Lady of Lago, Laghitello, Serra e Terrati, Princess of Modena and Reggio Maria del Pilar Garcia Sancho y Zabala, Duchess of Najera, 1864 Maria Eleonora I Boncompagni (1686–1745), also known as Maria Eleoonora I Boncompagni-Ludovisi, Marchioness of Populonia, Countess of Conza, Princess of Piombino, 1707–1745 Maria Lopez of Haro, Lady of Vizcaya, 1311–1325, 1326–1333 Maria Luisa de Aragon y Pernstein (d. 1663), 6th Duchess of Luna, 7th Duchess of Villahermosa.
Maria Manuela of Portugal (1538–87), Duchess of Viseu.
Maria Pacheco (c. 1400–?
Mechtild of Guelders, Duchess of Guelders, 1371–1384 Mechtild of Reifferscheid (d. 1437), Heiress of Lordship of Bedburg Melisende of Arsuf, Lady of Arsuf, ?–1236 Melisende of Chateaudun, Viscountess of Chateaudun Melisende of Jerusalem, Queen of Jerusalem, 1131–1153 Melissende of Maine (d. 890), heiress of Mayenne Mencia de Mendoza y Enriquez de Cabrera (d. 1619), Duchess of Huescar Meullent I of Castile, Countess of Aumale, 1279–1324 Miroslawa of Pomerelia (d. 1233), Regent Duchess of Pomerania-Wolgast, 1220–1233, for her son Barnim I of Pomerania-Wolgast (1219–1264) Munia Mayor of Castile (Munia Elvira)) (990–1066), 5th Countess of Castile  
In 1050, there is a deed for property written for lands in the City of Melegnano in Ferrara belonging to "Gregorius Bibitaquam" or Gregorius Bevilacqua.
In 1056, Gregorius Bevilacqua acquired more property in Ferrara for his loyalty to King Henry III of Germany (King Otto's grandson).
On May 7, 1059, the Principality of Bevilacqua was established located between Verona and Padova.
On May 25, 1060, the Duke and Marques of Tuscany gave the Bevilaqua family additional property in an adjustment entitled "In Comitatu Ariminensi in villa Corliano Bibens aquam".
This property in Corbiano was given to Bevilacqua for loyalty to Bonifacio Canossa, Marquis of Tuscany.
Bonifacio Canossa was the grandson of Atto Adalbert who helped Queen Adelaide of Italy escape from King Berengar.
Queen Adelaide married Holy Roman Emperor Otto I, and they granted Atto Adalbert the County of Canossa.
Bonifacio Canossa was assassinated in 1052, and his widow Marchioness Beatrice Canossa married Godfrey II, Duke of Lower Lorraine.
In 1055, the Holy Roman Emperor Henry III kidnapped Marchioness Beatrice and her daughter Countess Matilda Canossa (1046–1115).
Matilda was the last heir of the powerful Canossa family which ruled Tuscany in the 10th and 11th centuries.
She was a descendant of the German Saxon and Lombard kings, the Franconian kings of Luxembourg, and was the daughter of Frederick of Lorraine.
Her great-grandfather, Athene of Canossa, was made Count of Modena and Reggio by Holy Roman Emperor Otto 1.
Her grandfather had acquired Mantua, Ferrara and Brescia, and her father, Boniface acquired Tuscany, Spoleto, Parma, and Cremona.
Holy Roman Emperor Henry III (a direct descendant of Otto I) reconciled with Godfrey II and released his wife and daughter, Beatrice and Matilda in 1057.
When Godfrey II died in 1069, Countess Matilda Canossa married Godfrey III who was the brother of Pope Stephen IX.
Godfrey III nicknamed the Humpbacked, the son of Matilda's stepfather was murdered on February 26, 1076, Countess Matilda became the sole heiress to the richest estate in Italy. 
Saint Magdalen of Canossa is an Italian saint of the early 19th century, who set up the Institute of the Daughters of Charity and in whose name Canossian schools have been set up in many countries.