Hi,
This is all very intriuging. Where have you found info of this person coming and going from Ireland/ England and USA and Canada also where is the information re the nothern Ireland hospital.
I have scoured newspaper passenger lists and all those online but can't find him anywhere.
I know Demont Morenzy applied for a US passport in autumn 1858.

Where did the Durham relatives live exactly. Did they have a big estate up there? What were their names?
Also, are you living in UK?
I am in Derbyshire.

On Demont's second marriage certificate it states he was born in Lincolnshire. Very puzzling.

I am eagerly awaiting the results of your research into this devious man.
My friend in Pennsylvania will be thrilled if we can pin down her
great grandfather to some family in UK.

We have found so much about him after his graduation in Philadelphia but nothing of his origins,

Cheers and thanks
Marianne Head