According to Photius, the sixth book of the New History by Ptolemy Hephaestion reported that Thetis burned in a secret place the children she had by Peleus.
ɐkˈoːɹdɪŋ tə fˈoʊɾɪəs, ðə sˈɪksθ bˈʊk ʌvðə nˈuː hˈɪstɚɹi baɪ tˈoʊlmi hˈɛfiːstʃən ɹᵻpˈoːɹɾᵻd ðæt θˈɛɾiz bˈɜːnd ɪn ɐ sˈiːkɹᵻt plˈeɪs ðə tʃˈɪldɹən ʃiː hæd baɪ pˈɛlɪəs.