Charles de Blois, son of Guy I, Count of Blois, married Joan of Penthievre, the heiress of John III, Duke of Brittany; together, they became principal protagonists in the War of the Breton Succession.
The Second Breton War of Succession pitted the supporters of two different claimants against one another: those of the half-brother of the deceased John III, Duke of Brittany, Jean de Montfort, who relied on the Estates of Brittany who gathered in Nantes, and those of Charles I, Duke of Brittany, who was supported by King Philippe VI of France and was recognized as Duke of Brittany by the peers of the kingdom.
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# Sabina Catherine (11 August 1582 – 31 May 1618), married on 4 March 1601 to her uncle Count John III of East Frisia (1566 – 29 September 1625)
Ernst Christoph was the fourth of the eleven children of John III and his wife, Sabina Catherine.
Francis I (in Breton Fransez I, in French François I) (Vannes/Gwened, 14 May 1414 – 18 July 1450, Château de l'Hermine/Kastell an Erminig), was Duke of Brittany, Count of Montfort and titular Earl of Richmond, from 1442 to his death.
Anne of Brittany was the last independent ruler of Brittany, inheriting the Duchy as a girl of twelve in 1488, and securing her inheritance was a crucial matter for both the House of Habsburg and the French Crown.
He died without issue and so was succeeded by his nephew John III (son of Hugh II's brother Louis I of Chalon).
He sold all he possessed to the English, and his fief of Fougères to the Duke of Brittany.
However by 1332 he lost Scania which rebelled against the German rule submitting to the Swedish king.
He succeeded his elder brother William II as Marquis of Namur, when William died without children in 1418.
Peter II (in Breton Pêr II, in French Pierre II) (1418–1457, Nantes/ Naoned), was Duke of Brittany, Count of Montfort and titular earl of Richmond, from 1450 to his death.
The dispensation was granted by John XXIII, against quite recent precedent (the 1392 case of Bernard VII, Count of Armagnac who wished to marry the widow of his late brother John III, Count of Armagnac, and was refused by Pope Clement VII); and proceeded on the basis of an opinion of Peter of Ancarano (influenced by Andrea).
According to this account, Sigismund intended to assassinate his uncle Charles, during a banquet at Uppsala on February 12, following the royal funeral of John III on 1 February.
In 1329, King Christopher II concluded an agreement with Marsk Ludvig Eberstein, head of the armed forces, after his surrender at Hammershus and in 1329 made peace with Count Johann of Holstein.
: married on 4 March 1601 her uncle Count John III of East Frisia (born: 1566 – died: 29 September 1625)