Waldemar III, Prince of Anhalt-Zerbst
Waldemar III, Prince of Anhalt- Zerbst( died 1391) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Zerbst.
He was the youngest son of John II, Prince of Anhalt- Zerbst, by his wife Elisabeth, daughter of John I, Count of Henneberg- Schleusingen.
William III, Count of Burgundy
William III, Count of Burgundy( 1110 –1127) inherited his father William II's counties Burgundy and Mâcon as his only son, following William II's assassination by his barons in 1125.
William III was himself then assassinated aged only 17 in 1127 and succeeded by Renaud III, son of William III's great- uncle Stephen.
Katharina of Hanau
Catherine of Hanau also known as "Katharina" (25 January 1408 – 25 September 1460) was a German regent.
She was the regent of the County of Rieneck during the minority of her son from 1431 until 1434.
She was the eldest daughter of Reinhard II, who would become the first Count of Hanau in 1429, and Catherine of Nassau-Beilstein (d. 6 September 1459).
William IV, Princely count of Henneberg-Schleusingen
Princely count William IV of Henneberg- Schleusingen(" c." 1475 – 24 January 1559), a member of the House of Henneberg, was a ruler of the Principality of Henneberg, within the Holy Roman Empire.
The son of William III of Henneberg, William inherited the Principality of Henneberg on 26 May 1480, when his father died, and reigned until his own death nearly eighty years later, on 24 January 1559.
William married Anastasia of Brandenburg, a daughter of Albert Achilles, Elector of Brandenburg.
In 1543 – 1544 William embraced the Protestant Reformation.
In 1554 he signed a treaty of inheritance with John Frederick II, Duke of Saxony.
William died in Salorno five years later.
However, when his successor George Ernest, the last Prince of Henneberg, died, both the Ernestine and the Albertine branches of the Wettin dynasty claimed his estates.
In 1660 they were finally divided between the Ernestine duchies of Saxe- Weimar and Saxe- Gotha and the Albertine Maurice of Saxe- Zeitz, while the lordship of Schmalkalden went to William IV, Landgrave of Hesse- Kassel, honouring an inheritance treaty of 1360.
Robert Arondeaux
Robert Arondeaux( abbreviated as R. A. on some of his works) was a sculptor and medallist who was employed by both William III and Louis XIV.
Both his date of birth and date of death are unknown.
He was probably Flemish.
Matilda of Brandenburg, Duchess of Poland
Matilda of Brandenburg( b. ca. 1270 – d. bef. 1 June 1298), was a German princess member of House of Ascania and by marriage Duchess of Wrocław and High Duchess of Poland.
She was the second daughter of Otto V the Long, Margrave of Brandenburg- Salzwedel, by his wife Judith of Henneberg, daughter of Count Herman I, Count of Henneberg and heiress of Coburg and Schmalkalden.
Berthold VII, Count of Henneberg-Schleusingen
Berthold VII, Count of Henneberg- Schleusingen( nicknamed" the Wise", born: 1272 in Schleusingen; died: 13 April 1340, Schleusingen) was Count of Henneberg- Schleusingen from 1284 to 1340.
He was the son of Count Berthold V of Henneberg- Schleusingen( d. 1284) and his wife Sophie of Schwarzburg( d. 1279), the daughter of Count Günther VII of Schwarzburg.
He was confirmed as Imperial Prince by Emperor Henry VI in 1310.
From 1323 to 1330, he was guardian and regent of Louis V, Duke of Bavaria, the eldest son of Emperor Louis IV" the Bavarian", who had appointed his son as Margrave of Brandenburg and Count of Tyrol at the age of eight years.
Charles de Ligne, 2nd Prince of Arenberg
Princely Count Charles of Arenberg, duke of Aarschot (jure uxoris), baron of Zevenbergen, knight of the Order of the Golden Fleece, (Vollenhove, 22 February 1550 – Enghien, 18 January 1616) was the second Princely Count of Arenberg and a leading aristocrat of the Habsburg Netherlands, who served as a courtier, soldier, minister and diplomat.
William III, Princely count of Henneberg-Schleusingen
Princely count William III of Henneberg-Schleusingen (12 March 1434 – 25 May 1480 in Salorno)
was a member of the House of Henneberg.
He was the son of William II of Henneberg and Catherine of Hanau.
William III inherited the princely county of Henneberg in 1440, when his father died in a hunting accident.
In 1469, he married Margaret (1451 – 13 February 1509), the daughter of Duke Henry the Peaceful of Brunswick-Lüneburg.
In 1463 or 1464, the imperial city of Schweinfurt transferred the office of Imperial bailiff to William and made him patron of the city.
This combination of competencies offered Schweinfurt some degree of protection against the Bishopric of Würzburg.
Apparently out of personal piety, William promoted pilgrimages and founded churches and monasteries.
William died in 1480 in Salorno, when he was returning from Rome.
His grave stone can be found in the Assumption of Mary Church in Bolzano, near the altar.
In 1482, his body was transferred to the Henneberg family vault in the church of the monastery at Kloster Veßra.
The epitaph in Bolzano was sculpted by Erasmus Forster in Gardolo near Trento and installed in the Church in 1495 or 1496.
Like his father, he left only underage children, including his heir, William IV.
His widow, however, succeeded in securing their inheritance.
Herman I, Count of Henneberg
Herman I, Count of Henneberg( 1224 – 18 December 1290) was the son of Count Poppo VII of Henneberg and his wife, Jutta of Thuringia( born: 1184; died: 6 August 1235 in Schleusingen), the eldest daughter of Landgrave Herman I of Thuringia.
This was Boppo's second marriage, and also Jutta's second marriage.
Margrave Henry III of Meissen was Herman's half- brother from his mother's side.
Herman supported the election of his uncle Henry Raspe as anti-king of the Germans.
Herman founded the" new lordship" around Coburg and Eisenburg, which was inherited by the House of Wettin via his grand- niece Catherine of Henneberg.

Question: When was William Iii, Princely Count Of Henneberg-Schleusingen's mother born?
Answer: 25 January 1408