Good Morning
There's 2 possiblities
William Williams married Anne Salter at Guilsfield 5.11.1819 wit Thomas and Elizabeth Rowlands and then possible children over at Welshpool.
or
He's the William Williams who joined the Army 6.1.1813 supposedly aged 21.
Born Guilsford labourer .23rd Reg of Foot fought against Napoleon including Waterloo.
Shot twice ,once in arm ,once in left leg..Pension 29.2.1832
1851 census Meifod
William Williams 54 pensioner Meifod
Mary 38 Meifod
Emma and Sarah daughters 7 and 5 born Liverpool.
That's the best I can do.
Ciderdrinker