John IV, Duke of Brittany (1294-1345), contested Duke of Brittany, one of two sides in the Breton War of Succession
He sold all he possessed to the English, and his fief of Fougères to the Duke of Brittany.
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After the Portuguese Restoration War, during the reign of King John IV, the Counsel of War determined that the demolition of the monastery ruins, and the use of their rocks to build a coastal defense would help protect the coastal settlements; the Fort of São João Baptista das Berlengas was constructed from the remnants of the monastery ruins.
Under this flag, peasants and city dwellers had defeated the troops of the French count of Armagnac along the upper Rhine in 1439, 1443 and 1444.
Children: at least son John, possibly the daughter Euphemia was already born.
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.
In the same year Eric IV, supported by his sons Eric (later reigning as Eric V) and John (later John IV), captured the pawned lands without making the agreed repayment and before Lübeck could take possession of them.
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.
Brandes had claims due against John IV, Duke of Saxe-Lauenburg from a credit which Brandes had granted earlier.
John the Fearless, the duke of Burgundy, naturally supported his nephew, as did the States of Brabant.
Joan of Brittany, Baroness of Drayton (1341 – aft. 20 October 1399), married before 21 October 1385 Ralph Basset, 4th Baron Basset de Drayton
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Frans van Mieris the Younger, Groot Charterboek der Graven van Holland, Leiden, 1753
The Pactum Sicardi was a treaty signed on 4 July 836 between the Greek Duchy of Naples, including its satellite city-states of Sorrento and Amalfi, represented by Bishop John IV and Duke Andrew II, and the Lombard Prince of Benevento, Sicard.
Abbot Gerard van Goetsenhoven (1414–34) had much to do with the establishment of the Catholic University of Leuven, and was also delegated by John IV, Duke of Brabant to transact state affairs with the King of England and the Duke of Burgundy.
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.