If we look at the Red Book of Hergest we can see that it is not clearer in the original text
> A gỽr du maỽr a|wely ympenn yr orsed.
Literally "You will see a big black man atop the mound"
According to Will Parker, who has published his own translations of the Mabinogi tales
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> NB: When a person is described as ‘black’ in medieval Welsh literature, it usually denotes someone with black hair, and has no particular racial connotations.