William Prosser 
Born: 1844 in Merthyr Tydfil, Glamorgan, WalesWilliam's Family
Spouse: Mary Griffiths married 22nd April 1867 in Merthyr Tydfil, Glamorgan, Wales
Children: Griffith Moses Prosser, Tabitha Prosser, John William Prosser, Ann Prosser, Catharine Prosser, Mary Prosser
William's Heritage
Parents: John Prosser, Tabitha Llewelyn
Siblings: David Prosser, John Prosser, Ebenezer Prosser
Info from Richard B.Weber, 639 T.J.Jackson Drive, Falling Waters, W.V.25419-4524, U.S.A.
Born 1844 in Merthyr Tydfil, Glamorgan, Wales.
Married Mary Griffiths (BK Tree 868) 22 April 1867 Merthyr Tydfil, Glamorgan, Wales. Griffith Moses Prosser (BK Tree 869), the son of William Prosser and Mary Griffiths, was born in 1868 in Cwmbach. All three emigrated to US in 1871.
1871 Census Phillip Place, Aberdare, Merthyr Tydfil, Glamorganshire, Wales
| Name | Position | Age | Where Born | Occupation | BK No |
| William Prosser | Head | 27 | Glamorgan | Coalminer | 557 |
| Mary Prosser | Wife | 21 | Glamorgan | 868 | |
| Griffith M Prosser | Son | 2 | Glamorgan | 869 | |
| Tabitha Prosser | Daur | 0 | Glamorgan | 18 |
| Name | Position | Age | Where Born | Occupation | BK No |
| John Prosser | Head | 45 | Brecon, Brecknockshire | Coalminer | 556 |
| Mary Prosser | Wife | 42 | Merthyr Tydfil, Glamorgan | Coal Miners Wife | 554 |
| William Prosser | Son | 17 | Merthyr Tydfil, Glamorgan | Coal Miner | 557 |
| David Prosser | Son | 15 | Merthyr Tydfil, Glamorgan | Coal Miner | 558 |
| John Prosser | Son | 13 | Merthyr Tydfil, Glamorgan | Coal Miner | 559 |
| Ebenezer Prosser | Son | 11 | Merthyr Tydfil, Glamorgan | Coal Miner | 1681 |
| Morgan Roberts | StepSon | 19 | Merthyr Tydfil, Glamorgan | Coal Miner | |
| John Roberts | StepSon | 17 | Merthyr Tydfil, Glamorgan | Coal Miner | |
| Mary Ann Roberts | StepDaur | 15 | Merthyr Tydfil, Glamorgan | Coal Miners Daughter | |
| Philip Roberts | StepSon | 13 | Merthyr Tydfil, Glamorgan | Coal Miner | |
| David Roberts | StepSon | 11 | Merthyr Tydfil, Glamorgan | Coal Miner | |
| Eliza Thomas | Serv | 18 | Llangendeirne, Carmarthen | House Servant |
1851 CENSUS ABERCANAID DISTRICT. REF.HO.107/2458, ED.6. Piece: 2458 Folio: 207 Schedule: 240
| Name | Position | Age | Where Born | Occupation | BK No |
| John Prosser | Head | 34 | Bre Llanthony | Coalminer | 556 |
| Tabitha Prosser | Wife | 30 | GLA Merthyr Tydfil | 554 | |
| William Prosser | Son | 7 | GLA Merthyr Tydfil | 557 | |
| David Prosser | Son | 3 | GLA Merthyr Tydfil | 558 | |
| John Prosser | Son | 1 | GLA Merthyr Tydfil | 559 |