Question:  Arthur Machen was a Welsh author and mystic of the 1890s and early 20th century well known for his leading role in creating the legend of the Angels of Mons, a popular legend about a group of angels who supposedly protected members of what army?
Sentence (from "Arthur Machen"): Arthur Machen ( ; 3 March 1863 – 15 December 1947) was a Welsh author and mystic of the 1890s and early 20th century.
Relevant evidence: Yes