The Battle of Tryfrwyd was the tenth battle fought by Arthur

King Arthur

King Arthur is a legendary British leader of the late 5th and early 6th centuries, who, according to Medieval histories and romances, led the defence of Britain against Saxon invaders in the early 6th century. The details of Arthur's story are mainly composed of folklore and literary invention, and...

 as Dux Bellorum, mentioned in a number of early Welsh sources, amongst them the eleventh century poem Pa Gur and the works of the chronicler Nennius

Nennius

Nennius was a Welsh monk of the 9th century.He has traditionally been attributed with the authorship of the Historia Brittonum, based on the prologue affixed to that work, This attribution is widely considered a secondary tradition....

. Alongside Arthur, Manawydan fab Llyr

Manawydan fab Llŷr

; "Manawydan, the son of Llŷr" is a legendary tale from medieval Welsh literature and the third of the four branches of the Mabinogi. It is a direct sequel to the second branch, Branwen ferch Llŷr, and deals with the aftermath of Bran's invasion of Ireland and the horrific enchantment that...

 and Cai the Tall

Sir Kay

In Arthurian legend, Sir Kay is Sir Ector's son and King Arthur's foster brother and later seneschal, as well as one of the first Knights of the Round Table. In later literature he is known for his acid tongue and bullying, boorish behavior, but in earlier accounts he was one of Arthur's premier...

 are recorded as having fought in the battle; it is implied that the latter defeated a soldier (possibly chieftain) by the name of Garwlwyd

Garwlwyd

; "Man Dog Rough Grey" is a murderous monster in Welsh literature and mythology, sometimes identified as a werewolf. He made a corpse of a Briton every day, and two on Saturday so as not to have to kill on a Sunday. He was ultimately assassinated by the hero Diffydell mab Dysgyfdawd, which was...

during the conflict.