Horgan added his second on the restart - his 10th in 12 competitive games - while Denis Hickie (2) and Niall Ronan were also on target as Declan Kidney's men chalked up their 15th straight win in Dublin.

David Holwell, who had a flawless nine-from-nine night with his right boot, opened proceedings with a fifth-minute penalty and although Percy Montgomery nullified the 3 point with a kick of his own after 26 minutes it was one way traffic for the rest of the game.

Holwell added a second penalty soon after before Gissing was driven over from close range. Three minutes later Horgan got his first before a Holwell chip through allowed Contemponi to make it 27-3 at the break.

Horgan, Hickie and young flanker Ronan - bagging a cheeky 63rd-minute try, collecting his own chip kick to score - helped Leinster draw within four points of second-placed Munster in the latter stages.