The Hagoday is a doorknocker fashioned after a fierce looking beast holding a ring inside its mouth. The Hagoday commonly found on the entryway of safe haven locations such as churches, monasteries, cathedrals, etc. Legend has it that a fugitive could seek refuge and protection inside buildings with the Hagoday adorning its front door.
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Reference: Body Guards: Protective Amulets and Charms, Desmond Morris