Benevento's 1-0 victory over AC Milan on Saturday was not enough to prevent their relegation from Serie A, which was confirmed by Crotone's 2-1 win at Udinese on Sunday.
Roberto De Zerbi's side picked up their first away league triumph of the season at San Siro courtesy of Pietro Iemmello's strike, keeping their slim survival hopes intact despite Cheick Diabate's dismissal with 10 minutes remaining.
However, their maiden campaign in Italy's top flight was guaranteed to end in relegation after Davide Faraoni's 86th-minute winner against Udinese put 17th-place Crotone 14 points clear of Benevento with just four games left.
Benevento failed to earn a single point until they drew 2-2 with Milan courtesy of goalkeeper Alberto Brignoli's stoppage-time header on December 3, with their first win coming four matches later against Chievo.
