Bran may've gotten decapitated, but his head was put to good use. According to this 14th-century document, His noggin lies under the White Hill in London, facing France, so nobody invades Britain.
The bard Taliesin was BFFs with Bran. Tali recalls grieving over Branny when B died in Ireland.
Bran is the hero to his damsel-in-distress of a sister, Branwen. In the Mabinogion, when Branwen's hubby, the king of Ireland, treats her poorly, Bran invades Ireland, but gets his head knocked off in the process.
Lawhead's Merlin loves to reminisce about Britain in the good old days. In some ways, the narrator thinks, Britain hadn't changed much since Bran's days. If only he could see it today…
What is it with Bran and Jesus? Ellis hops on the Christianity theory, claiming Bran was one of the first popes of the Catholic Church.