Baldwin V, Count of Flanders
Baldwin V of Flanders( c. 1012 – 1 September 1067) was Count of Flanders from 1035 until his death.
He was the son of Baldwin IV, Count of Flanders, who died in 1035.
Marie I, Countess of Boulogne
Marie I or Mary (1136 – 25 July 1182 in St Austrebert, Montreuil, France) was the "suo jure" Countess of Boulogne from 1159 to 1170.
She also held the post of Abbess of Romsey for five years until her abduction by Matthew of Alsace, who forced her to marry him.
Matilda of Boulogne, Duchess of Brabant
Matilda of Boulogne (1170 – 16 October 1210) was the younger daughter of Matthew, Count of Boulogne and Marie I, Countess of Boulogne.
Matilda became Duchess of Brabant by her marriage to Henry I, Duke of Brabant.
Matilda's parents' marriage was annulled the year she was born and her mother became a Benedictine nun at St. Austrebert, Montreuil and died in 1182.
Matilde's father continued to reign as Count of Boulogne until his death in 1173, when her older sister Ida became countess.
At the age of nine, Matilda married Henry I, Duke of Brabant, in 1179.
The couple went on to have:
Matilde died in 1210 or 1211.
She was buried at St. Peter's in Leuven.
Theresa of Portugal, Countess of Flanders
Theresa of Portugal( Coimbra, c. 1151; – Veurne, 6 May 1218; or) was Countess of Flanders by marriage to Philip I, Count of Flanders, and Duchess of Burgundy by marriage to Odo III, Duke of Burgundy.
She was the daughter of the Portuguese king Afonso I and Matilda of Savoy.
She served as co-regent of Portugal with her brother during the illness of their father Afonso I of Portugal from 1172 until 1173, and regent of Flanders during the interim period after the death of her spouse and the accession of his heir.
Michèle Kahn Spike
Michèle Kahn Spike is an American lawyer, historian, and lecturer.
She graduated from Boston University School of Law in 1976 and became a member of the Bar of the State of New York in 1977, concentrating in international corporate law.
From the late 1980s until 2011, she lived in Florence, Italy together with her husband, noted art historian John Spike.
Since fall 2012 she has been teaching at the Marshall- Wythe School of Law at the College of William& Mary, and she was appointed as Visiting Professor of the Practice of Law in 2017.
She is known for her biography of Matilda of Tuscany," Tuscan Countess: The Life and Extraordinary Times of Matilda of Canossa", which was published to favorable reviews in 2004.
She also collaborated with John Spike on his study of Caravaggio and Mattia Preti.
Spike has been a member of the Bar of the State of New York since 1977 and during those 40 years engaged in the practice of international corporate law.
In the spring of 2015, in honor of the 900th anniversary of the death of Matilda of Canossa, Spike curated the exhibition, Matilda of Canossa and the Origins of the Renaissance, for the Muscarelle Museum of Art in coordination with the Marshall- Wythe School of Law at the College of William and Mary.
The catalogue for that exhibition was published by the Muscarelle Museum of Art.
In 2015, Spike also published, An Illustrated Guide to the ‘ One Hundred Churches ’ of Matilda of Canossa, Countess of Tuscany( Centro Di, Florence, 2015).
In 2016, also in honor of the 900th anniversary of the death of the Countess, she curated the exhibition," Matilda di Canossa( 1046- 1115)
La donna che mutò il corso della stori/ Matilda of Canossa( 1046- 1115) the Woman who Changed the Course of History" for the Casa Buonarroti in Florence.
The catalogue, available in Italian and in English, was published by Centro Di, Florence.
As a member of the Standing Commission on Anglican and International Peace with Justice Concerns of the Episcopal Church( USA) 2003- 2009, Spike participated in delegations to Palestine and Israel as well as to United Nations conferences in New York City and Amman, Jordan.
Since 2005, Spike has been Chancellor to the Bishop of the Convocation of Episcopal Churches in Europe.
She most recently lectured on the Rule of Law at the Jerusalem Peacebuilders Camp in Brattleboro, Vermont.
Judith of Flanders
Judith of Flanders( or Judith of France)( 843 – c. 870) was queen consort of Wessex and countess consort of Flanders.
She was the eldest daughter of the West Frankish King and later Holy Roman Emperor Charles the Bald and his wife Ermentrude of Orléans.
Through her marriages to two Kings of Wessex, Æthelwulf and Æthelbald, she was twice a queen.
Her first two marriages were childless, but through her third marriage to Baldwin, she became the first Countess of Flanders and an ancestor of later Counts of Flanders.
One of her sons by Baldwin married Ælfthryth, a daughter of Æthelbald's brother, Alfred the Great.
She was also an ancestor of Matilda of Flanders, the consort of William the Conqueror, and thus of later monarchs of England.
Margaret I, Countess of Flanders
Margaret I of Flanders( c. 1145- died 15 November 1194) was ruling countess of Flanders" suo jure" from 1191 to her death.
She was the daughter of Thierry, Count of Flanders, and Sibylla of Anjou, and the heiress of her childless brother, Philip of Flanders.
Arnulf I, Count of Flanders
Arnulf of Flanders( c. 890 – 27 March 965), called the Great, was the first Count of Flanders.
Matilda of Béthune
Matilda of Béthune( died 8 November 1264), was countess of Flanders by marriage to Guy, Count of Flanders, and heir to the titles Lady of Béthune, of Dendermonde, of Richebourg and of Warneton, as well as Advocatess of the Abbey of Saint Vaast at Arras.
She was the mother of Robert, Count of Flanders, known as Robert of Béthune after his mother.
Margaret I, Countess of Burgundy
Margaret I( 1310 – 9 May 1382), was a ruling Countess Palatine of Burgundy and Artois from 1361 and 1382.
She was also countess of Flanders, Nevers and Rethel by marriage to Louis I, Count of Flanders, and regent of Flanders during the minority of her son Louis II, Count of Flanders in 1346.

Question: What is the date of death of Matilda Of Boulogne, Duchess Of Brabant's mother?
Answer: 25 July 1182