Mr Robert Mernagh was born in the village of Ballywilliam near New Ross, Co Wexford, Ireland on 30 December 1883.
He was the son of Matthew Mernagh (b. 1833), a farm labourer, and Mary Doyle (b. 1840), both Wexford natives who had married around 1866. He had six known siblings (out of a total of nine): Anne (b. 1869), Patrick (b. 1871), James (b. 1872), Matthew (b. 1877), Mary (b. 1880) and Moses, who was his twin brother, who died in infancy.
Robert appears on the 1901 census as a farm servant living at 17 Ballynabearna, Barrack, Wexford. He later emigrated on 8 May 1910 aboard the Celtic, bound for Chicago where his brother Matthew lived.
His parents appeared on the 1911 census living at 7, Ballyleigh, Ballyanne, Wexford and they were described as illiterate farmers and it is likely Robert visited them at this address when he returned home for a visit in late 1911. For his return voyage to the USA he would be accompanying his cousin Elizabeth Doyle who was also travelling to Chicago.
He boarded the Titanic at Queenstown as a third class passenger (ticket number 368703, £7, 15s).
Robert Mernagh died in the disaster. His body, if recovered, was never identified.
His estate, worth £30, was administered to his father Matthew on 10 April 1913.