Which preposition to use with dufferin

to Occurrences 2%

Lord Dufferin to Lady John Russell

as Occurrences 1%

The fund was originally started by Lady Dufferin as the direct result of a command by the late Queen Victoria, and it was intended to provide the services of medical women for the Purdah women of India who, owing to the strictness of their rules, were not infrequently debarred from the full benefit of medical treatment by men.

Which preposition to use with  dufferin