help looking for a marriage please

[DORAN54]

we have been searching for a marriage between william williams baptised ruabon  6may 1827 parents john&sarah to an ellen williams born1825 manchester her parents are also john&sarah info from her baptism their 1st child robert was born about1849  as he is shown as 12yrs old old on the 1861 census we have the family through the census's  except can't find either  of them on the 1841
 have looked england and wales for marriage as  she's from manchester and they were living llanfair denbighshire  hoping someone can help out thank you

[Milliepede]

How many children on the 1851 - just Robert?  And where was he born?

[rosie99]

1851
https://familysearch.org/ark:/61903/1:1:QKVB-4YBH

William Williams 24   Llanfair, Denbighshire
Ellen Williams   Wife   26   Manchester, Lancashire
Robert    2   Denbigh, Denbighshire
Mary    8 MOS    Denbigh, Denbighshire

[rosie99]

Which of the childrens birth certificates do you have 

[DORAN54]

How many children on the 1851 - just Robert?  And where was he born?

hi thanks for reply
1851  piece 2507 folio383 page34 2 children robert  2 mary 8months both born denbigh ,denbighshire

1861 piece4301 folio4 page 2,   6 children ,robert 12,mary E 10,samuel 8,anne6,margaret3,william 1
parents ellen 36. william 34

[DORAN54]

Piece:    4604
Folio:    26
Page Number:    17
1891 census shows Ellen Williams    66
Margaret Williams    34
Kate Williams    27
Sarah Williams    19
Henry Williams    26

[DORAN54]

Piece:    5501
Folio:    73
Page Number:    30   1881 census
William Williams    54
Ellen Williams    56
Robert Williams    32
Henry Williams    17
David Williams    15
Sarah Williams    10

[rosie99]

Which of the childrens birth certificates do you have 

I was wondering how you know Ellens maiden name was Williams 

[DORAN54]

Which of the childrens birth certificates do you have 

I was wondering how you know Ellens maiden name was Williams 

from her baptismName:    Ellen Williams
Baptism Date:    25 May 1825
Parish:    Manchester, St Mary, St Denys and St George
Father's name:    John Williams
Mother's name:    Sarah Williams
Archive Roll:    759