Miss Mary Mullin (Mary Lennon) was born in Clarinbridge, Co Galway, Ireland on 31 August 1893.
Hailing from a Roman Catholic family, she was the daughter of Redmond Mullin (b. 2 May 1864), a merchant, and Delia Hynes (b. circa 1870) who had married in St Nicholas' Roman Catholic church, Galway on 16 February 1885.
She had five known siblings: Owen Joseph (b. 1 June 1888), Bartholomew Joseph (b. 12 July 1889), Daniel (b. 30 July 1890), Bridget Mary (b. 21 July 1891) and Margaret Mary (b. 12 August 1892).
Mary's parents ran a public house and shop in their village and they were a financially comfortable family for the time in Ireland. To reflect their affluence at the time, when Mary's father died on 17 September 1893, when she was less than a month old, he left an estate valued at £10,690, 16s, 1d.
Mary appears on the 1901 census as a seven-year-old living with her mother and siblings and a host of servants at house 4, Hillpark, Clarinbridge. By the time of the following census she was a pupil at a boarding school, Loretto Convent, in Rathfarnham, south Dublin but her family were then listed at house 3 in Clarinbridge.
By 1912 Mary's family had an assistant in their shop, a 20-year-old Longford native named Denis Lennon. The two fell in love and made plans to leave Ireland and cross the Atlantic. Originally booked to travel aboard Cymric, the coal strike changed their plans and they boarded the Titanic at Queenstown as third class passengers (ticket number 370371 which cost £15, 10s) and were using the names Dennis and Mary Lennon.
Mary's brother Joe (and possibly also her mother) reportedly pursued the couple all the way to Queenstown, Joe carrying a loaded firearm in his fury, but they reached the dock too late. It has been suggested that Mary Mullin and Denis Lennon were cousins, the latter's mother's maiden name also being Mullin, but this was not the case.
Mary Mullin, along with Denis Lennon, died in the sinking. Their bodies, if recovered, were never identified.
What became of Mary's family in Ireland following the disaster is unclear.