This picture is of Mrs Sarah Allen nee Rofe and was taken about 1864/5 as ths is the only times the photographer's name is styled this way and was at Rose Crescent.
Sarah was born about 1794 in Cambridge, the daughter of William Rofe and his wife, Sarah. She married Charles Allen in 1824. Charles and Sarah's daughter, Sarah Allen, married my great-great uncle, civil engineer Henry Nathan Maynard, in 1859. Her mother died in 1879, aged 85, in Monmouthshire, where the family were living during the construction of the Crumlin Viaduct.
Photographers Details: W Farren Photographer Rose Crescent, Cambridge.