Roman Republic
In 77 BC, the senate sent one of Sulla's former lieutenants, Gnaeus Pompeius Magnus ("Pompey the Great"), to put down an uprising in Spain. By 71 BC, Pompey returned to Rome after having completed his mission. Around the same time, another of Sulla's former lieutenants, Marcus Licinius Crassus, had just put down the Spartacus-led gladiator/slave revolt in Italy. Upon their return, Pompey and Crassus found the populares party fiercely attacking Sulla's constitution. They attempted to forge an agreement with the populares party. If both Pompey and Crassus were elected consul in 70 BC, they would dismantle the more obnoxious components of Sulla's constitution. The two were soon elected, and quickly dismantled most of Sulla's constitution.

Q: When did Pompey return to Rome after having quelled the uprising in Spain?
71 BC