Massaesylia is a Regional Power holding lands in North Africa split between the Mauretania and Numidia provinces. Both Massaesylia and its historic rival, Massylia, played influential roles in the conflicts between Rome and Carthage, with their proficiency in cavalry proving invaluable battlefield advantages to the side they backed. Historically, after siding with the defeated Carthage in the Second Punic War, Massaesylia was annexed by Massylia into the united kingdom of Numidia.
A conglomeration of tribal states, the Kingdom of Numidia was united as a result of the fall of Carthage, directly caused by Rome. Later allying themselves with this new Italian power, Numidia continued to enjoy autonomy until a breakdown in relations drew the ire of Rome.
Massaesylia begins as an independent nation with no allies or subjects.
Massaesylia starts the game in a very precarious situation, surrounded by Carthage and its many subjects. Securing an alliance with Rome will help dissuade early aggression from Carthage. This alliance will also be vital for when war eventually does break out. Carthage has more population, cohorts, and military tech so utilizing Rome and any other allies you can gather will be necessary for defeating them. Your Pirate Heritage allows you to perform slave raids to bring slaves back to your capital. To perform a slave raids you will need a navy with at least 10 ships to be adjacent to a port with at least 5 population and no forts. Slave Raiding will cause 1 Aggressive Expansion point and an additional 1 point per raided port (up to 1). Your Capital starts with only 4 population so it is important to immediately build your initial navy to 10 ships and begin raiding ports across the Western Mediterranean in order to rapidly boost its population.
As Massaesylia it can be a good idea to use the entice governor interaction to steal provinces from Carthage, helping to equalize your power. Be mindful that this costs 20 aggressive expansion, so be wary of taking too much territory too quickly.