1881 census it is Llandana( with Car in the margin)

looks more like Llandillo in 1871 (Landdillo) , but 1861 claims Monmouthshire - so how about Llandenny ?

http://www.genuki.org.uk/big/wal/MON/Llandenny/index.html

Llantilio Pertholey is close to Abergavenny which might link to

Ann Herbert ----------------------------------------------------------
Event(s):
Birth:
Christening: 03 JUL 1796 Abergavenny, Monmouth, England
------------------------------------------------------------
Parents:
Father: Charles Herbert
Mother: Ann
-------------------------------------------------
Source Information:
Batch No.: Dates: Source Call No.: Type: Printout Call No.: Type:
I055703 Film
Sheet:

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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>

Shirley

I have researched all the Herbert families in the Llandenny area but dont have an Ann born abt 1797, I will have a look at her birthplace on the census.

Mike

Shirley

The 1871 census looks an attempt at Llantilio, I think the significant name in this family and there are several Isaac Herberts scattered around Monmouthshire, at Llangwm, Penalt, Monmouth & Dixton.

Here are some marriages from my index that may be of help.

Herbert, Abraham, Usk, Christiana, Prichard, Usk, Usk, B, 03/06/1765
Herbert, Charles, Abergavenny, Elizabeth, Rosser, Abergavenny, Abergavenny, B, 23/02/1784
Herbert, Charles, Llangoven, Mary, Bigham, Llangoven, Llangoven, L, 24/06/1811
Herbert, Charles, Mynyddislwyn, Mary, Roberts, Bedwellty, Bedwellty, B, 17/03/1792
Herbert, Charles, Abergavenny, Mary, Williams, Abergavenny, Abergavenny, L, 18/02/1787
Herbert, Charles, Llansoy, Rachel, Morgan, Llansoy, Llansoy, B, 07/02/1792
Herbert, Charles, Abergavenny, Susanna, Morgan, Abergavenny, Abergavenny, B, 08/01/1791
Herbert, Daniel, Llangoven, Jane, Lloyd, Llandenny, Llandenny, L, 06/07/1797
Herbert, Herbert, Crickhowell,Brecs., Rachel, Morgan, Abergavenny, Abergavenny, B, 10/07/1803
Herbert, Isaac, Penalt, Anne, Davies, Penalt, Penalt, L, 15/08/1776
Herbert, Isaac, Llangwm, Mary, Richards, Llangwm, Llangwm, B, 29/05/1767
Herbert, Job, Bedwellty, Mary, Watkin, Bedwellty, Bedwellty, B, 15/05/1809
Herbert, John, Llantilio Pertholey, Ann, Jones, Llantilio Pertholey, Llantilio Pertholey, ., 01/06/1731
Herbert, John, Abergavenny, Ann, Pearkes, Abergavenny, Abergavenny, L, 18/11/1792
Herbert, John, Llangwm, Anne, Jones, Llangwm, Llangwm, B, 15/05/1780
Herbert, John, Llangwm, Elizabeth, Morgan, Tregare, Tregare, B, 15/05/1760
Herbert, John, Llanarth, Elizabeth, Prosser, Llanarth, Llanarth, L, 09/01/1803
Herbert, John, Abergavenny, Jane, Prosser, Abergavenny, Abergavenny, B, 29/12/1806
Herbert, John, Abergavenny, Margaret, Lewis, Abergavenny, Abergavenny, ., 14/09/1749
Herbert, John, Llansoy, Susan, Griffiths, Llansoy, Llansoy, B, 09/09/1763
Herbert, Lewis, Monmouth, Elizabeth, Dowding, Monmouth, Monmouth, B, 21/11/1802
Herbert, Thomas, Llangoven, Anne, Nicholas, Cwmcarvan, Llangoven, L, 17/04/1798
Herbert, Thomas, Llangattock Vibon Avel, Anne, Tudor, Llangoven, Llangoven, B, 09/07/1761
Herbert, Thomas, Skenfrith, Elizabeth, James, Skenfrith, Skenfrith, B, 02/01/1775
Herbert, Thomas, Llantilio Pertholey, Elizabeth, Morgan, Llantilio Pertholey, Llantilio Pertholey, ., 18/05/1746
Herbert, Thomas, Rockfield, Elizabeth, Watkins, Rockfield, Rockfield, B, 31/12/1762
Herbert, Thomas, Llanginor?, Mary, Bardin, Bassaleg, Bassaleg, ., 25/06/1746
Herbert, Thomas, Llansoy, Mary, Walters, Llansoy, Llansoy, B, 04/03/1805
Herbert, Thomas, Skenfrith, Susannah, Davis, Skenfrith, Skenfrith, ., 22/07/1750
Herbert, Thomas, Llantilio Pertholey, Winifred, Prichard, Llantilio Pertholey, Llantilio Pertholey, ., 13/01/1729
Herbert, William, Llandegveth, Ann, Powell, Llangibby, Llangibby, L, 05/07/1796
Herbert, William, Abergavenny, Catherine, Jones, Abergavenny, Abergavenny, B, 19/07/1772
Herbert, William, Llantilio Crossenny, Martha, Jones, Llantilio Crossenny, Llantilio Crossenny, B, 17/06/1796
Herbert, William, Llantilio Pertholey, Martha, Powell, Abergavenny, Abergavenny, B, 01/02/1756
Herbert, William, Llanarth, Mary, Lewis, Penrhos, Penrhos, ,

Thank you both. You've certainly given me something to think about, and puzzle over!
I'll have to get a map of the area to see how these places relate to each other.