Who was Methusalem Hughes

[neno]

Now I have
Marriage 1803  Methusalem Hughes  son of Thomas Hughes Cooper and Jane his wife to Margaret Davies daughter of John Davies and Jane his wife. Witness John Killing
Baptisms  at Machynlleth Parish Church
John 1804 of Uwchygarreg
Jane  1806  of Isygarreg these were townships in the parish of Machynlleth
Griffith 1815  of Glaspwll in the parish of Machynlleth Wesleyan circuit Penegoes, Llanwrin and Darowen parishes close to Machynlleth
Hugh   1819
Evan   1822
Thomas 1824  these three at Graig Independent Chapel, Machynlleth Address given as Gellifydir., Glaspwll, Isygarreg
burial at Machynlleth parish church  Methusalem  1833  servant of Mathew Wiliams, of Uwchygarreg.
Methusalem and Margaret seem to have spent their married life in the rural area around Machynlleth.

I have tried to find John Killing witness to the marriage and Mathew Williams his employer but as yet have had no luck.
Methusalem was OH 3xgreat grandfather.  I keep coming back to him and slowly I am filling in the gaps.
Thank you all for your help