Gabriel-Joseph de Lavergne, comte de Guilleragues (1628-1684), was a French politician of the 17th century.

For a time, he was secretary of the King's Chamber, and he also director of the Gazette de France.

In 1677, he was named ambassador at the Ottoman Court

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

. In 1679 and 1680, Louis XIV through Guilleragues encouraged the Ottoman Grand Vizier Kara Mustafa

Kara Mustafa

Merzifonlu Kara Mustafa Pasha was an Ottoman military leader and grand vizier who was a central character in the empire's last attempts at expansion into both Central Europe and Eastern Europe.-His Name:...

 to intervene in the Magyar Rebellion

Kuruc

The kuruc was a term used to denote the armed anti-Habsburg rebels in Royal Hungary between 1671 and 1711....

 against the Habsburg

Habsburg

The House of Habsburg , also found as Hapsburg, and also known as House of Austria is one of the most important royal houses of Europe and is best known for being an origin of all of the formally elected Holy Roman Emperors between 1438 and 1740, as well as rulers of the Austrian Empire and...

, but without success. Louis XIV communicated to the Turks that he would never fight on the side of the Austrian Emperor Leopold I

Leopold I, Holy Roman Emperor

| style="float:right;" | Leopold I was a Holy Roman Emperor, King of Hungary and King of Bohemia. A member of the Habsburg family, he was the second son of Emperor Ferdinand III and his first wife, Maria Anna of Spain. His maternal grandparents were Philip III of Spain and Margaret of Austria...

, and he instead massed troops at the eastern frontier of France. These reassurances encouraged the Turks not to renew the 20-year 1664 Vasvar truce

Peace of Vasvár

The Peace of Vasvár was a treaty between the Austrian Habsburg Monarchy and the Ottoman Empire which followed the Battle of Saint Gotthard of August 1, 1664, and concluded the Austro-Turkish War...

 with Austria and to move to the offensive.

Guilleragues died of apoplexy

Apoplexy

Apoplexy is a medical term, which can be used to describe 'bleeding' in a stroke . Without further specification, it is rather outdated in use. Today it is used only for specific conditions, such as pituitary apoplexy and ovarian apoplexy. In common speech, it is used non-medically to mean a state...

 in Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

 in 1684.

He is thought to have been the author of Letters of a Portuguese Nun

Letters of a Portuguese Nun

The Letters of a Portuguese Nun , first published anonymously by Claude Barbin in Paris in 1669, is a work believed by most scholars to be epistolary fiction in the form of five letters written by Gabriel-Joseph de La Vergne, comte de Guilleragues , a minor peer, diplomat, secretary to the Prince...

.

Works

• Relation véritable de ce qui s'est passé à Constantinople
• Ambassade du Comte de Guilleragues et de M. de Girardin auprès du grand Seigneur