The Masaesyli were a North African tribe of western Numidia

Numidia

Numidia was an ancient Berber kingdom in part of present-day Eastern Algeria and Western Tunisia in North Africa. It is known today as the Chawi-land, the land of the Chawi people , the direct descendants of the historical Numidians or the Massyles The kingdom began as a sovereign state and later...

 and the main antagonists of the Massylii

Massylii

The Massylii or Maesulians were a Berber federation of tribes of eastern Numidia which was formed by an amalgamation of smaller tribes during the 4th century BC. They were ruled by a king. On their loosely defined western frontier was the powerful rival the kingdom of the Masaesyli. To their east...

 in eastern Numidia.

During the Second Punic War

Second Punic War

The Second Punic War, also referred to as The Hannibalic War and The War Against Hannibal, lasted from 218 to 201 BC and involved combatants in the western and eastern Mediterranean. This was the second major war between Carthage and the Roman Republic, with the participation of the Berbers on...

 the Masaesyli initially supported the Roman Republic

Roman Republic

The Roman Republic was the period of the ancient Roman civilization where the government operated as a republic. It began with the overthrow of the Roman monarchy, traditionally dated around 508 BC, and its replacement by a government headed by two consuls, elected annually by the citizens and...

 and were led by Syphax

Syphax

Syphax was a king of the ancient Algerian tribe Masaesyli of western Numidia during the last quarter of the 3rd century BC. His story is told in Livy's Ab Urbe Condita .-Biography:...

 against the Massyllii, who were led by Massinissa. After Massinissa threatened to unite all Numidians in a confederacy against Rome, the Masaesyli turned against Rome and undertook the siege of Carthage

Carthage

Carthage , implying it was a 'new Tyre') is a major urban centre that has existed for nearly 3,000 years on the Gulf of Tunis, developing from a Phoenician colony of the 1st millennium BC...

. Syphax was defeated, however, and spent the remainder of his days in Roman captivity, while his tribe was assimilated into the kingdom of Massinissa.