Why did the Abbasid dynasty fall?

This is when the Abbasid Empire starts to fall apart; heavy taxation, agrarian disorder, societal mishap, and revolts all play the Abbasid Empire into the hands of the Buyids, a Persian group that captures Baghdad, the capital, and controls the Abbasid for a few years. ... The invasion of the Mongols, who sack Baghdad.

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

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i think a judge or jury, as they preside over the court and is the central figure in a trial.

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~ destiny ^_^