[3] Born in Dublin in 1836, he was eldest of the four children of Isaac and Isabella Lefroy.
[7] Lefroy was devoted to Switzerland, and he was one of the summer chaplains of the Intercontinental Church Society annually from 1867 to the year of his death.
From 1875 to 1878 he was a member of the Alpine Club, but although fond of mountain climbing made no great expeditions.
He helped to build the English churches at Zermatt, Riffelalp, Gletsch, and Adelboden.
[9] Leroy was active in English Freemasonry, being initiated in 1899 in the Union Lodge No 52, Norwich.