Ramon Berenguer III was the count of Cerdanya (1162–1168), as Peter, and count of Provence (1173–1181).

He was the second son of Raymond Berengar IV of Barcelona

Ramon Berenguer IV, Count of Barcelona

Ramon Berenguer IV , sometimes called the Holy, was the Count of Barcelona who effected the union between the Kingdom of Aragon and the Principality of Catalonia into the Crown of Aragon....

 and Petronilla of Aragon. He received Cerdanya, including Carcassonne

Carcassonne

Carcassonne is a fortified French town in the Aude department, of which it is the prefecture, in the former province of Languedoc.It is divided into the fortified Cité de Carcassonne and the more expansive lower city, the ville basse. Carcassone was founded by the Visigoths in the fifth century,...

 and Narbonne

Narbonne

Narbonne is a commune in southern France in the Languedoc-Roussillon region. It lies from Paris in the Aude department, of which it is a sub-prefecture. Once a prosperous port, it is now located about from the shores of the Mediterranean Sea...

, on his father's death, but relinquished it to his younger brother Sancho

Sancho, Count of Provence

Sancho was the count of Cerdanya from 1168, Provence from 1181 to 1185, and Roussillon from 1185. He was the youngest son of Count Raymond Berengar IV of Barcelona and Queen regnant Petronilla of Aragón....

 in 1168. He never did govern his inherited territories. In 1173, his elder brother, Alfonso

Alfonso II of Aragon

Alfonso II or Alfons I ; Huesca, 1-25 March 1157 – 25 April 1196), called the Chaste or the Troubadour, was the King of Aragon and Count of Barcelona from 1164 until his death. He was the son of Ramon Berenguer IV of Barcelona and Petronilla of Aragon and the first King of Aragon who was...

, granted him Provence.

In 1176, he joined Sancho in conquering Nice

Nice

Nice is the fifth most populous city in France, after Paris, Marseille, Lyon and Toulouse, with a population of 348,721 within its administrative limits on a land area of . The urban area of Nice extends beyond the administrative city limits with a population of more than 955,000 on an area of...

 from Genoa

Genoa

Genoa |Ligurian]] Zena ; Latin and, archaically, English Genua) is a city and an important seaport in northern Italy, the capital of the Province of Genoa and of the region of Liguria....

. He then ventured to war with the lords of Languedoc

Languedoc

Languedoc is a former province of France, now continued in the modern-day régions of Languedoc-Roussillon and Midi-Pyrénées in the south of France, and whose capital city was Toulouse, now in Midi-Pyrénées. It had an area of approximately 42,700 km² .-Geographical Extent:The traditional...

 and the count of Toulouse. He was assassinated on 5 April 1181 by the men of Adhemar of Murviel near Montpellier

Montpellier

-Neighbourhoods:Since 2001, Montpellier has been divided into seven official neighbourhoods, themselves divided into sub-neighbourhoods. Each of them possesses a neighbourhood council....

. Provence passed to his brother Sancho.