The current Celtic champions scored early tries though Irish test duo Isaac Boss and Andrew Trimble, with David Humphreys converting both to open a 14-0 lead after only 20 minutes.

However they were pegged back just before the break when Aled Brew crossed for the Dragons, and Ceri Sweeney converted.

Ulster pressed in the opening stages of the second period but were unable to capitalize and then had to withstand some late pressure from the visitors before they could guarantee taking the points and keeping just behind Leinster in the table.