At the foot of the dunes are the old towns and villages of Sassenheim, close to which are slight remains of the ancient castle of Teilingen (12th century), in which the countess Jacoba of Bavaria died in 1433.
He died in 1417, leaving an only child, a daughter, Jacqueline (or Jacoba), who had in her early youth been married to John, heir to the throne of France.
JACOBA, Or Jacqueline (1401-1436), countess of Holland, was the only daughter and heiress of William, duke of Bavaria and count of Holland, Zeeland and Hainaut.
John of Touraine died in April 1417, and two months afterwards Jacoba lost her father.
Acknowledged as sovereign in Holland and Zeeland, Jacoba was opposed by her uncle John of Bavaria, bishop of Liege.
By the mediation of John the Fearless, a treaty of partition was concluded in 1419 between Jacoba and John of Bavaria; but it was merely a truce, and the contest between uncle and niece soon began again and continued with varying success.
In 1420 Jacoba fled to England; and there, declaring that her marriage with John of Brabant was illegal, she contracted a marriage with Humphrey, duke of Gloucester, in 1422.
Two years later Jacoba, with Humphrey, invaded Holland, where she was now opposed by her former husband, John of Brabant, John of Bavaria having died of poison.
Jacoba, however, escaped from prison in disguise; and for three years struggled gallantly to maintain herself in Holland against the united efforts of Philip of Burgundy and John of Brabant, and met at first with success.
By a treaty, made in July 1428, Jacoba was left nominally countess, but Philip was to administer the government of Holland, Zeeland and Hainaut, and was declared heir in case Jacoba should die without children.
Jacoba now made her last effort.
Only on condition that Jacoba abdicated her three countships in his favour would he allow her liberty and recognize her marriage with Borselen.
Nuyens, Jacoba van Beieren en de eerste helft der XV.
Von Overstraten, Jacoba van Beieren (Amsterdam, 1790).