Dutch builder, primarily known in the UK for coaches, both separate bodies and integrals. They do build buses though, and have even built double-deck service buses for both the UK and Ireland in the past!
The Citylink name was born out of the Scottish Bus Group's express services; the brand there is owned jointly by Comfort DelGro of Singapore and Stagecoach Holdings. Comfort DelGro also use the brand in Ireland, with coaches contracted in from Callinan, Claregalway. One such vehicle is seen here on the stopping service from Dublin Airport to Galway.