Gaspar de Vallier was a Marshall of the Knights of Malta

Knights Hospitaller

The Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta , also known as the Sovereign Military Order of Malta , Order of Malta or Knights of Malta, is a Roman Catholic lay religious order, traditionally of military, chivalrous, noble nature. It is the world's...

, who was in command of the fortress of Tripoli

Tripoli

Tripoli is the capital and largest city in Libya. It is also known as Western Tripoli , to distinguish it from Tripoli, Lebanon. It is affectionately called The Mermaid of the Mediterranean , describing its turquoise waters and its whitewashed buildings. Tripoli is a Greek name that means "Three...

 during the Siege of Tripoli (1551)

Siege of Tripoli (1551)

The Siege of Tripoli occurred in 1551 when the Ottomans besieged and vanquished the Knights of Malta in the fortress of Tripoli, modern Libya. The Spanish Habsburgs had established a fort in Tripoli in 1510 under Charles V, and remitted it the Knights in 1530...

. He was French, from the region of Auvergne

Auvergne (région)

Auvergne is one of the 27 administrative regions of France. It comprises the 4 departments of Allier, Puy de Dome, Cantal and Haute Loire.The current administrative region of Auvergne is larger than the historical province of Auvergne, and includes provinces and areas that historically were not...

 ("Langue d'Auvergne"). In Tripoli, he commanded 30 knights (some authors say 200) and 630 Calabria

Calabria

Calabria , in antiquity known as Bruttium, is a region in southern Italy, south of Naples, located at the "toe" of the Italian Peninsula. The capital city of Calabria is Catanzaro....

n and Sicilian

Sicily

Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

 mercenaries. The city was captured on 15 August 1551.

Upon his return to Malta, Gaspar de Vallier was heavily criticized by the Grand Master D'Omedes

Juan de Homedes y Coscon

Fra Juan de Homedes y Coscon was a Spanish Knights Hospitaller. He was the 47th Grand Master of the Order of Malta, between 1536 and 1553...

, brought in front of a tribunal, and stripped from the habit and cross of the Order.

De Vallier was later rehabilitated by Grand Master Jean Parisot de la Valette

Jean Parisot de la Valette

Fra' Jean Parisot de Valette was a French nobleman and 49th Grand Master of the Order of Malta, from 1557 to 1568. He succeeded La Vallette as grandmaster and continued the construction of Valletta...

.