Caesarea Mauretaniae, meaning Caesarea of Mauretania in Latin, was a Roman-Berber colonia in the Maghreb. It was the capital of Mauretania Caesariensis and is now called Cherchell, in modern Algeria.
Phoenicians from Carthage founded a settlement on the northern coast of Africa, 100 km west of the present-day city of Algiers at present Cherchell around 400 BC to serve as a trading station and named the city Iol or Jol.
It became a part of the kingdom of Numidia under Jugurtha, who died in 104 BC. Caesarea Mauretaniae became very significant to the Berber monarchy and generals of Numidia. The Berber Kings Bocchus I and Bocchus II lived there, as occasionally did other Kings of Numidia. Iol was situated in an area called Mauretania, which was then a part of the Numidian kingdom.
During the 1st century BC, due to the city’s strategic location, new defences were built.
The last Numidian king Juba II and his wife, the Greek Ptolemaic princess Cleopatra Selene II, were forced to flee the other part of Numidian kingdom because the local population disapproved of their king being too Romanized, which caused civil unrest between 26 and 20 BC. Roman Emperor Octavianus Caesar Augustus had intervened in the situation and in 33 BC Rome and divided the Numidian Kingdom into two. One half of the kingdom became a part of the Roman province of Africa Nova, while western Numidia and Mauretania (the second half of the kingdom) became one kingdom in the hands of a Berber prince named Juba II. Although his father was once an ally of Pompey, Juba had lived in Rome under the tutelage of Julius Caesar, learning to read and write Greek and Latin. As he was considered too Roman to rule, Juba and his wife, Cleopatra Selene (the daughter of Marcus Antonius and last Pharaonic queen Cleopatra), were at the mercy of civil unrest when Emperor Augustus intervened. Juba II renamed Iol Caesarea or Caesarea Mauretaniae, in honor of the emperor. Caesarea would become the capital of the Roman client kingdom of Mauretania, which became one of the important client kingdoms in the Roman Empire, and their dynasty was among the most loyal client Roman vassal rulers.