Jean Pierre Le Claire, Très Noble Seigneur

Parents. Son of François 'Pierre' Le Claire and Marie-Anne Du Moine — known locally as “Nanon” — of the Lorraine / Alsace frontier.

Spouse. Jacqueline Antoinette Catherine Van der Vyvere (1726 – 1789).

Jacqueline Antoinette Catherine Van der Vyvere (1726–1789), of the established Van der Vyvere family. Research indicates her marriage involved a dowry of approximately 90,000 livres — a sum extraordinary by the standards of the period, associated with major merchants, financiers, office-holders or noble families. By relative status and economic power, the order of magnitude approaches several million pounds in modern equivalence, potentially in the region of £20 million.

Children. Father of at least two sons whose lines diverge here: Louis Jean Baptiste Leclaire (1753–1825), through whom the modern bloodline descends, and Général de division Théodore François Joseph Leclaire (1752–1811), Chevalier of Saint-Louis and Commander of the Legion of Honour, whose career carried the family name into the highest ranks of the Revolution and the Empire.

Jean Pierre Le Claire occupies a pivotal position within the family history. Through his marriage to Jacqueline Van der Vyvere, the family combined long-standing Lorraine ancestry with significant Flemish wealth and influence. His children would establish both the distinguished military branch represented by Théodore François Joseph Leclaire and the branch from which the modern LeClaire family descends.

Jean Pierre Le Claire (1718–1793) is a principal figure in the documented LeClaire line. His marriage to Jacqueline Antoinette Marie Catherine Van der Vyvere of the Flemish Van der Vyvere family marks the first major movement of the principal line into the Lower Rhine. Lived during the reigns of Louis XV and Louis XVI, he represents the generation immediately preceding the French Revolutionary era — and died in 1793, in the year of the Terror, having lived through the apogee, decline and final collapse of the Ancien Régime in which his fathers had served.

Jean Pierre Leclaire's generation represents the consolidation of the family's position within the educated and influential classes of Lorraine and Alsace.

That his son entered the officer corps suggests the family possessed sufficient wealth, education and social standing to secure opportunities unavailable to ordinary citizens — a position reinforced by the Van der Vyvere alliance and its accompanying dowry.

Through Jean Pierre the family maintained the status and resources necessary to continue its upward trajectory into the late eighteenth century. The Van der Vyvere connection stands as one of the strongest indicators of wealth within the documented family history.

From his household emerged the senior officer Théodore François Joseph Leclaire, Chevalier of the Royal and Military Order of Saint-Louis — the most decorated member of the documented French line — and his brother Louis Jean Baptiste Leclaire, through whom the bloodline of the present House continues.

By the late eighteenth century, the children of Jean Pierre Le Claire and Jacqueline Van der Vyvere included a future Général de Division of France, multiple descendants of substantial standing in Alsace and Lorraine, and the branch from which the modern LeClaire family descends. Few generations in the family's history proved as influential as theirs.