'Iolo Morganwg' and [Harri Jones].
'Iolo Morganwg' and [Taliesin Williams].
'Iolo Morganwg' and others.
'Iolo Morganwg', William Owen-Pughe, David Samwell and William Jones.
'Iolo Morganwg'.
'Iorwerth Ceitho' and Evan Jones.
'Islwyn'.
'J.S.P.'.
'Jonathan' (pseudonym).
'Llew Llwyfo'.
'Meirion' (pseudonym).
'Mihangel Glan Gele'.
'Myfyr'.
'Offa'.
'Omega' (pseudonym)
'Pyll Glan Conwy'.
'S. R.' and others.
'Sylwedydd' (pseudonym).
'Tafolog'.
'Talhaiarn' and others.
