Thus for a time the title by which the family was known was not Bousbecque, but la Lys.
In December 1348, was signed the Treaty of Dunkirk, by the Earl of Lancaster, the Earl of Suffolk, and Sir Walter Manny on the part of England, and on the part of Flanders, by ten delegates of rank; among their names is found that of Jehan de la Lys.
About this time the seigneuries of la Lys and Bousbecque passed to the house of Pontenerie; William of that name marrying Marie de la Lys, heiress of the seigneuries, and assuming—no doubt as one of the conditions of the contract—the name of la Lys. His children were severally known as, Guillaume, Jeanne, and Marie de la Pontenerie, dit de la Lys.
Again there was a failure in the male line, and Marie, the youngest daughter, brought the seigneuries to Bauduin de Hingettes.
Their son, Jehan de Hingettes, married a Halluin, and dying in 1466, his daughter Adrienne de Hingettes, dit de la Lys, became representative and heiress of the family. She married Gilles Ghiselin I., and thus the seigneuries of la Lys and Bousbecque passed into the possession of the noble house of Ghiselin.[15]
On the marriage of Adrienne to Gilles Ghiselin I. the title of la Lys was dropped, and that of Bousbecque resumed.
Gilles Ghiselin I., Seigneur of Bousbecque, knight of Jerusalem and Cyprus, was a man of considerable importance, and from the following notice it would appear that he was a man of high character. In 1474 there was a dispute between the dean and chapter of Messines[16] on the one side, and the abbess, convent, and church on the other. It appears that the bailiffs of the abbess had arrested a man in a house belonging to the dean and chapter. The chapter resented this intrusion on their rights, and the case was submitted to two men for arbitration, Gilles Ghiselin I. and Guillaume Wyts.
George Ghiselin I., great uncle of the Ambassador.
Gilles Ghiselin I., died in 1476, leaving six children by his wife Adrienne; two of whom, George and Gilles, were destined to occupy a prominent part in the history of their time.
George, the elder, succeeded to the seigneury of Bousbecque; his grandmother was a Halluin, and he also was married to a member of the same house.