Isaac Thellusson

Isaac de Thellusson (14 October 1690 – 2 September 1755) was a Genevan diplomat and banker.

Early life Thellusson was born on 14 October 1690 in Geneva, Republic of Geneva, into a Huguenot family which had fled France for Geneva in the 16th century. He was the son of Théophile Thellusson, a merchant in Lyon, and Jeanne Guiguer (sister to Louis Guiguer, who built Prangins Castle). Thellusson was a great-grandson of the theologian Theodore Tronchin.

Career When his father died in 1705, Thellusson had already been away from Geneva a year to gain experience in commerce. He first stayed in Basel, then in Amsterdam, before settling in London with his uncle Isaac Guiguer who was an associate of Nicolas Tourton, where he learned languages and banking.

Thellusson moved to Paris in 1707 and began working for the Tourton et Guiguer bank, which had been founded c. 1703 by his uncle Louis Guiguer with Jean-Claude Tourton.

Therefore, Thellusson decided to create a new company in 1728, joining forces with François Tronchin to found the François Tronchin et Cie bank.

Ennoblement On 8 June 1737, King Frederick William I of Prussia ennobled Thellusson and his wife. The ennoblement was recognized in France, by letters patent given at Versailles, in July 1782.

Personal life

On 27 September 1722, Thellusson was married to Sarah Le Boullenger (1700–1770) in Leiden. She was a daughter of Abraham le Boullenger, Lord of Rixdorp, a Huguenot merchant who had emigrated from Rouen in 1685, and Anne van der Hulst, who was Dutch. a merchant who settled in London in 1760 and purchased Brodsworth Hall in 1790; he married Ann Woodford (1740–1805), whose posterity in 1761.

Thellusson died on 2 September 1755 at his property in Champel, in the Republic of Geneva. and had descendants including Diana, Princess of Wales, as well as her sons William, Prince of Wales heir to the British throne, and Prince Harry, Duke of Sussex.