The History Channel says trick or treating has undetermined origins, but it is believed to have traces in Celtic festivals, Roman Catholic holidays, medieval practices and British politics.

The city also has a Celtic connection which includes celebrating an annual festival that morphed into what we now know as Halloween. Tourists can delve into this history at Aquincum Museum ...

There is no single date when Halloween started, as the celebration has its origins in an ancient Celtic festival that dates back at least 2,000 years. In the U.S., Halloween was popularized in the ...

Here is the history behind the holiday and how it came to be. According to Britannica, Halloween can be traced to the ancient festival of Samhain. It was a Celtic holiday celebrated on Nov. 1 ...