A fearsome robber from Thessaly who had the unusual habit of killing those he encountered by dashing his head against theirs. He was killed in the same fashion by Heracles, who proved to have an even harder head that he. It is from him that the term "Termerian mischief" comes.
- Aken, Dr. A.R.A. van. (1961). Elseviers Mythologische Encyclopedie. Amsterdam: Elsevier.
- Plutarch. Theseus, 11.