Mairgen - legendary poet and warrior who resembles the Welsh Taliesin
Cathbadh - a Druid who appears in various tales of the Ulster Cycle
Conall Cernach - warrior-hero of Ulster; his name suggests his status: Conall means "strong" and Cernach translates roughly as "victorious"
Conchobar - King of Ulster; closely linked with the hero Cu Chulainn
Conn - a High King of Ireland; known as "Conn of the Hundred Battles"
Cu Chulainn - a hero and warrior par excellence; his name means "hound of Culann"
Cu Roi - in the Ulster Cycle, he is a sorcerer who transforms himself into various guises
Deirdre - beautiful woman whose tragic tale is part of the Ulster Cycle
Emer - the wife of Cu Chulainn
Fedelma - poet and prophetess in the service of Queen Medb
Ferghus - the King of Ulster prior to Conchobar
Finn Mac Cool - hero of the Fionn Cycle; he was also the leader of the Fianna
Fintan - the salmon of knowledge
Grainne - in the Fionn Cycle, she is betrothed to Finn, but falls in love with Diarmaid
Mac Da Tho - appears in the Ulster Cycle as a king of Leinster; in reality a god of the Otherworld
Maeldun - hero who went on a legendary voyage
Medb - Queen of Connacht; a translation of her name is "she who intoxicates"
Naoise - romantically linked to Deirdre in the Ulster Cycle
Oisin - son of Finn (the hero of the Fionn Cycle); a warrior and poet
Partholon - he led the initial group that colonized Ireland, according to legend (in the Book of Invasions)
Scathach - a legendary female warrior who trained Cu Chulainn