The Triads of the Horses name his horse as Melyngan Mangre ("Yellow-white Stud-horse"), one of the three bestowed horses, and the Hergest Triads refer to Lleu himself as one of the three "Red Ravagers of the Island of Britain" as well as one of the three "Golden Shoemakers".
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According to the Book of Taliesin, he fought alongside Gwydion at the Battle of the Trees, in which he assisted his uncle in enchanting the trees to rise up in battle against Arawn, king of Annwn.