Llewelyn Williams was born in Rhyl, Flintshire, North Wales in 1895.
The 1911 Census shows that the family lived at 2 Greenfield Place, Vale Road, Rhyl, Flintshire. The head of the family was Llewelyn Williams aged 55, a Steam Roller Driver. His wife Louisa Williams (nee Roberts) and their three children – William H Williams aged 26, a Blacksmith, Minnie Williams aged 19 and Llewelyn Williams aged 16, a Printers Apprentice.
Llewelyn enlisted at the Recruitment Centre, Rhyl with 13th Battalion, Royal Welsh Fusiliers.
Six other Flintshire Soldiers were also killed in action on Monday 10 July 1916 during the Battle of Mametz Wood, they were – Sergeant 20496 James Congdon and Private 16534 Oscar Darby, who are remembered on the Rhyl War Memorial, Private 21235 Thomas Charles Jones MM, who is remembered on the Bagillt War Memorial and Lance Corporal 20977 Peter Jones and Private 26433 John Richard Jones who are remembered on the Greenfield War Memorial and 2nd Lieutenant James Victor Sinnett-Jones, who is remembered on the Caerwys War Memorial..
He is also remembered on The North Wales Heroes Memorial Arch, Deiniol Road, Bangor, North Wales and on a Remembrance Plaque at The Royal Alexandra Hospital, Marine Drive, Rhyl, Flintshire.