 
 <prompt> Wetin be di first group wey dem mention? Based on di previous question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: The Roman Empire reach im greatest territorial extent during di 2nd century AD; di next two centuries see as Roman control begin dey reduce for dia outlying territories. Economic wahala, wey include inflation, and pressure from outside for di frontiers join body make di 3rd century dey politically unstable, with emperors dey come throne just to dey quickly replaced by new usurpers. Military expenses dey increase steadily during di 3rd century, mainly because of di war with Sassanid Persia, wey come back to life for di middle of di 3rd century. Di army double for size, and cavalry and smaller units replace di legion as di main tactical unit. Di need for money lead to increase for taxes and decrease for numbers of di curial, or landowning, class, and di number of dem wey dey ready to carry di burden of holding office for dia native towns dey reduce. More bureaucrats dey needed for di central administration to handle di needs of di army, wey lead to complaints from civilians say dem get more tax-collectors for di empire pass tax-payers. 