Beowulf:
Hwæt we garde-
(Lo! We, of the Spear Dan-)
na ingear dagum, þeod cyninga
(-es in days of yore, of those great kings,)
þrym ge frunon huða æþelingas elle[n]
(of their power heard, how those princes deeds of valour)
fremedon.
(accomplished.)
Hear-beowulf-read-in-the-original-old-english.html Iron age Danes and Swedes fighting.
Neaderthal man....Grendal candidate?? (Leaving aside the issue of the underwater domicile...)