Jamie Vardy came off the bench to score a customary goal against Arsenal and send Leicester to within a point of the Premier League summit with a first win at the Gunners' home since 1973.
Vardy, 33, had missed two games with a calf injury but was reintroduced after a largely sterile opening hour at Emirates Stadium and promptly ended a 262-minute goal drought in the league.
The former England international headed home fellow substitute Cengiz Under's smart pass to bring up a remarkable 11th Premier League goal against Arsenal. Only Wayne Rooney, with 12, has more.