1818 There is a re-marriage of Richard Jenkins, widower, to Hannah Rowlands on 17 Oct 1818. It would appear that this marriage produced the children on the chart below. Certainly Mary is the product of that marriage, and the mother of Mary is Hannah Rowlands. The other baptisms in the parish church do not give the mother's maiden name, but appear to be this family. Richard Jenkins is dead by 1841 census, so little more can be gleaned about him.
It is not possible to say with any certainly whether or not "my" Richard Jenkins, is the same man that re-married Hannah Rowlands. There are a number of other contemporary Richard Jenkins in the area of the same sort of age at this time.
One can pick up the christening details in IGI for Richard and Hannah Jenkins at Llanidloes Parish Church (except Mary)
1819 Elizabeth Jenkins baptised 23 Jan 1819
1821 William Jenkins baptised 18 Feb 1821
1823 Mary Jenkins baptised 2 Jan 1823 at Zion Independent Chapel in Llanidloes as the child of Richard JINKINS and Hannah Rowlands
1825 Benjamin Jenkins baprised 15 May 1825
1826 Jane Jenkins baptised 19 Nov 1826
1830 Margaret Jenkins baptised 20 May 1830
1841 census Hannah Jenkins is now a Widow, living at Long Bridge Street, Llanidloes with Elizabeth, William, Mary and Benjamin of the above children, Plus the addition of Thomas Jenkins, probably the illegitmate son of her daughter Elizabeth.
1851 census Now living in Chapel Lane, Llanidsloes with her sister and one daughter Mary, and probably 3 illegitimate grandchildren my various daughters.
1861 census. Hannah appears to have died between 1851 and 1861, as I cannot find her in 1861 census.
Richard Jenkins 1770