-- who married a relative of the famous British Esperantist Montagu C. Butler.

from Wikipedia:

Agnata Frances Butler née Ramsay (1867–1931) was a classical scholar. She was among the first generation of women to take the Classical Tripos examinations at the University of Cambridge, and was the only person in 1887 to be placed in the top division of the first class for Tripos. She translated book VII of Herodotus' Histories and then married the Master of Trinity College, Montagu Butler, to become the leading hostess of Cambridge.

Henry Montagu Butler was the first cousin once removed to Montagu Christie Butler, with whom he may easily be confused if either is referred to simply as "Montagu Butler".

Some of the works of the esperantist one:

http://www.hymnary.org/person/Butler_Montagu?tab=t...

Hello! Thanks for the info.