This dashing fellow is Théophile-Jules-Henri "Theo" Marzials who was, despite his exotic monicker, a British composer, singer and poet. His French clergyman father married his English mother and Theo, born in 1850, was the youngest of five children.
At the age of twenty he started work in the British Museum as a junior assistant in the librarian's office where his path crossed those of Coventry Patmore, John Payne, Arthur O'Shaughnessy, and Edmund Gosse (who may have been his lover). He was not really cut out for a library career - he reportedly once yelled "Am I not the darling of the British Museum reading room?" from the balcony of that noble institution.
He nevertheless continued working there until retiring at the ripe old age of 32, on a handsome pension of £38 a year supplemented by royalties estimated at around £1000 annually. These were derived from his successful career as a composer, noted for his settings of Christina Rossetti's verses and some popular ballads that were all the rage in the 1880s.
He moved to Devon in the early 1900s where he became addicted to chloradyne (a potent patent medicine invented in the 19th century by Dr. John Collis Browne, a doctor in the British Indian Army as a treatment for cholera, diarrhea, insomnia, neuralgia and migraines. It was made from a mixture of laudanum, tincture of cannabis, and chloroform.) He died in Colyton in February 1920.
As a poet he had his admirers - Gerard Manley Hopkins for one - and his work featured in that era-defining periodical The Yellow Book. He is now forgotten, though not entirely, and for rather a sad reason. His poem 'A Tragedy', included in his only published collection The Gallery of Pigeons and Other Poems (1873), has strong claims to being the very worst poem ever written in the English language. I first came across it the other day in Ross and Kathryn Petras' harrowing anthology Very Bad Poetry (1997). It isn't bad in the way (say) William McGonagall's oddly memorable and sweet-natured doggerel is bad. Marzial's astonishing perpetration has no mitigating qualities.
I've typed it out in full below for you to read and savour.
A Tragedy by Theophile Marzials
The barges down in the river flop.
From the slimy branches the grey drips drop...
To the oozy waters, that lounge and flop...
And my head shrieks - "Stop"
And my heart shrieks - "Die."...
Ugh! yet I knew - I knew
If a woman is false can a friend be true?
It was only a lie from beginning to end--
My Devil - My "friend."...
So what do I care,
And my head is empty as air -
I can do,
I can dare
The barges flop
I can dare, I can dare!
And let myself all run away with my head