| Birth* | 6 May 1839 | Robert Mercer was born at Wigan, Lancashire, England.1,2 |
| Christening | 27 May 1839 | He was christened at Wigan, Lancashire, England.2 |
Census 1841 (Resident) | 6 Jun 1841 | The 1841 UK Census enumerated Robert Mercer as residing at School Common, Wigan, Lancashire, England, along with Elizabeth Mercer, Edward Burrell, Catherine Burrell, Ellen Mercer and Thomas Burrell.3 |
Census 1851 (Family) | 30 Mar 1851 | The 1851 UK Census enumerated Robert Mercer as being son of Edward Mercer, Head of the household at Greenhoughs Terrace, Wigan, Lancashire, England. Others resident include Elizabeth Mercer, Catherine Mercer, Ellen Mercer, Margaret Bridget Mercer and Thomas Burrell.1 |
| Occupation* | 30 Mar 1851 | Robert Mercer was a labourer in an iron forge.1 |