Biographical notes:
Surname also spelled Marchallsay.
Occupation: Miner coal hewer (1911, 1921).
Employer: Crumlin Valley Colliery.
Addresses: At 1891 census - 56 High Street, Trevethin, MON; At 1901 census - 12 Railway Crossing, Twynyffrwd, Abersychan, MON; At 1911 census - 182 Viaduct Road, Garndiffaith, Abersychan, MON; At 1921 census - 40 Trosnant Street, Pontypool, MON.
Reference documents:
1891 census return (Henry Smithwick).
1901 census return (George Jones).
1911 census return (George Jones).
1911 marriage registration index record.
1921 census return.