Constantine, one of the oldest cities in the world (pronounced /kɔ̃.stɑ̃.tin/), (in Arabic: قسنطينة,in Algerian Arabic: Qsentina), is a municipality in northeastern Algeria, the capital of the wilaya of Constantine. With more than 448,000 inhabitants, this metropolis is the third most populated city in the country. The Grand Constantine extends over a radius of about fifteen kilometres in the form of an agglomeration comprising a mother city and a series of satellites. The agglomeration of Constantine had 943,112 inhabitants in 20153, only 54% of whom live in the municipality of Constantine.

Constantine, is an important city in the Mediterranean history. Formerly Cirta, capital of Numidia from 300 BC to 46 BC, it later came under Roman rule. It owes its current name to Emperor Constantine I since 313.