Apollyon, literally "Destroyer;" one of Satan's companion archdemons [i]
"But now, in this Valley of Humiliation, poor Christian was hard put to it; for he had gone but a little way before he espied a foul fiend coming over the field to meet him: his name is Apollyon" [ii]

References:
[i] https://en.wikipedia.org/wiki/The_Pilgrim%27s_Progress
[ii] John Bunyan The Pilgrims Progress (1678) Chapter 4. Project Gutenberg Website http://www.gutenberg.org/files/39452/39452-h/39452-h.htm [accessed 27Apr2020]

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