(2) the marriage of William and Rachel is the Excise Officer, I found similar information, whereabouts not at hand.
(3) Seth Powell is right too. There was Seth Snr and Seth Junior. Seth Snr b about 1680-90 (I forget right now) and died 1723. I found his burial on archive.org in a register book from Landdewi. Sadly, his wife Margaret died Sept 1722, Seth made his Will in November (yes, I found another Will!) then died in April 1723.
Perhaps Seth knew he was going to die. He particularly set out guardians for their two soon to be orphaned infants.
Seth Jnr went on to have a longer and more successful life. Born 1718, died 1785.