Mammon

Mammon is a play by Sydney Grundy (1848-1914)[1]

Not to be confused with Mammon, Robot Born of Woman, a comedic play by Robert Llewellyn.

The play was originally written for W.H. Vernon and first performed at the Strand Theatre, London, on 7 April, 1877. It became a standard item in Vernon's repertoire.

https://en.wikipedia.org/wiki/Sydney_Grundy

Allardyce Nicoll. 1975. A History of English Drama 1660-1900 (Volume 5, Late Nineteenth Century) Cambridge University Press:p.396 [2]