One of these people used the finger of a kitchen maid to prove that his foster mother, the wife of Elphin, had not been seduced by Rhun.
In addition to being a judge, a figure of this profession was married to ScÃ©ne, who died at sea, and helped the Milesians survive a magical storm during their invasion of Ireland against the Tuatha DÃ© Danann. The Welsh Triads name Aneirin as "prince of [this profession]," which he shared with the aforementioned Amergin. A group of these people led by Heinin Vardd were enchanted to say only the nonsense word "blerwm," causing their king Maelgwin to think they were drunk. While in an undersea palace, a Russian folk hero used a gusli and his skills in this profession to win the daughter of the (*) Sea Tsar. One of these people used the finger of a kitchen maid to prove that his foster mother, the wife of Elphin, had not been seduced by Rhun. That member of this profession was a reincarnation of Gwion Bach, who had been swallowed by Ceridwen, and had a name that meant "radiant brow." For 10 points, name this profession held by the Welsh Taliesin, who combined music and poetry. 
In addition to being a judge, a figure of this profession was married to ScÃ©ne, who died at sea, and helped the Milesians survive a magical storm during their invasion of Ireland against the Tuatha DÃ© Danann.
bards [accept any reasonable equivalents, such as  singers,  minstrels, etc.; prompt on  musicians]