The father of Bran the Blessed in Welsh myth is Llŷr, often written Llyr in English-language texts. Llŷr is the patriarch of the family at the centre of the second branch of the Mabinogi, where his children include Brân the Blessed, Branwen and Manawydan.
Brân is portrayed as a giant and high king of Britain. His most famous story begins when his sister Branwen marries Matholwch, king of Ireland. After Branwen is abused in Ireland, Brân leads an expedition across the sea to rescue her, triggering a catastrophic war. The tale ends with Brân mortally wounded and ordering his companions to carry his severed head back to Britain.
Llŷr himself is a shadowy figure, and Welsh tradition gives him little independent narrative beyond his family connections. He is commonly compared with the Irish sea-associated figure Ler, the father of Manannán mac Lir, though the precise relationship is uncertain. The answer is sometimes misspelled or simplified as “Llyr”; the stored form identifies the correct mythological father.