Wikipedia
Caeneus
In Greek mythology, Caeneus (, Kaineus) was a Lapith hero of Thessaly. According to Ovid's Metamorphoses, he was originally a woman, Caenis, daughter of Atrax.
In Apollonius of Rhodes' Argonautica, he is briefly noted as the great father of a lesser son, Coronus, who sailed forth among the Argonauts. The striking mythic image of this hero is that, indomitable through his more-than-human power, his enemies the Centaurs resorted to driving him into the ground with timbers.
they could neither force him to yield, nor yet dispatch him,
but unbowed, unbroken, he went into earth down under,
crushed by a shattering hail of heavy pine trunks.