The All Saints Day celebration was also called All-hallows or All-hallowmas (from Middle English Alholowmesse meaning All Saints' Day) and the night before it, the traditional night of Samhain in the Celtic religion, began to be called All-Hallows Eve and, eventually, Halloween.
I think it’s both, but probably leaning more towards ethos.
This isn’t a question you should post a picture of the text
