It is unknown when Seuthes III died, with estimations ranging from the end of the 4th century to the 280s. Coins minted in his name include overstruck coins of Cassander (died 297) and Lysimachus (died 281), implying that his coins were produced until the early years of the 3rd century BC. Seuthes was symbolically buried in the tumulus of Golyama Kosmatka, without his actual corpse. It may well be that he had been killed in battle, perhaps fighting against Lysimachus or with him as an ally.