Agnes Rebecca McArthur was born on 4 June 1851 in Ontario. She was the daughter of Daniel McArthur and Rebecca Cromer Johnson. Agnes had two half-sisters, Mary Elizabeth Johnson Wallis and Catherine Johnson Milne.
Agnes married Henry Quillman ca 1871. The couple had four sons and one daughter. They resided for many years on their farm in Flamborough West, Wentworth County.
Henry died in 1914. Agnes died on 27 August 1933 in Flamborough West. They are buried at Crown Cemetery, Morriston, Wellington County which is a short distance from their farm.