Grendel and Grendel's, A Compendium of the Ancient Gods

In the great hall of Heorot, the high-roofed mead-hall of King Hroðgar of the Danes, songs were sung and feasts were held; and the songs of joy were heard far across the moor. They were heard in particular by Grendel, who was a creature of the marsh, descended (so the poet of Beowulf tells us) from Cain — that is, from the line of mankind that had been cursed for the first murder, and from which had sprung also the giants and the wicked spirits.

For twelve winters Grendel came against Heorot. He came at night, while the warriors slept on their benches; he tore up door and bolt, dragged thirty men from their beds at a time, and bore them off to his lair to devour. The hall was emptied of its warriors, for none would sleep there; the throne of Hroðgar was unattended; the kingdom of the Danes was made waste by this single creature, whom no weapon could harm — for Grendel was protected by some magic that turned aside iron.

Beowulf the Geat heard the news in his own country and came across the sea with fourteen companions to offer his help. That night in the hall he wrestled with Grendel, hand to hand without weapons, and tore the monster's arm from its shoulder. Grendel fled to his marsh and there died of the wound. The arm was hung from the rafters of Heorot in token of the victory.

But the next night Grendel's mother came up out of the marsh — a creature more terrible than her son, as the poet says — and bore away one of Hroðgar's councillors in revenge for her son's death. Beowulf followed her down into the haunted mere, dove into the dark water (where the surface itself was scummed with blood), and at the bottom of the lake found her hall. There he wrestled with her and at last killed her with a giant-made sword that he found hanging in her hall; and he took also Grendel's head, which lay there, and brought it back to Heorot in token of the second victory.

Curator’s note

What the sources say, and what later tradition added. The sources for this bay

Grendel and his mother are described in Beowulf, lines 86-1798 — substantially the entire first half of the great Old English poem, composed probably in the eighth century. The poem's monsters are one of the few clearly identifiable mythological elements in surviving Old English literature, and have been the subject of immense scholarly attention since J. R. R. Tolkien's lecture "Beowulf: The Monsters and the Critics" (1936) restored them to their proper centrality in the poem. The relation of Grendel to the Eddic-style giants of Norse myth is plain, but Grendel is also fitted into a Christian framework as a descendant of Cain — an Old English innovation. The mother is the more terrible of the two, an inversion of usual gender expectations in heroic literature, and her hall at the bottom of the mere is one of the most haunting set-pieces in the poem.

When the sources speak

Dated witnesses for The Norse and Germanic Gods. A date marks when the evidence was written down, not when the belief began. The whole timeline

2nd–1st millennia BCE: Indo-European language dispersals and regional Bronze Age cultures provide a remote comparative background, not a recoverable common canon.
c. 500 BCE–1 CE: Iron Age material culture, names, sanctuaries, and classical ethnography offer early but external evidence for Celtic and Germanic religions.
1st–4th centuries CE: Roman inscriptions and provincial cults preserve many Celtic, Germanic, and local divine names.
4th–8th centuries CE: Migration-period and early medieval conversion transform ritual institutions while heroic traditions continue.
8th–11th centuries CE: Viking Age poetry, runic evidence, archaeology, and Scandinavian conversion form the core context of Norse myth.
9th–12th centuries CE: Slavic, Baltic, and Finnic traditions enter chronicles and missionary accounts, often through hostile observers.
11th–14th centuries CE: Irish, Welsh, and Icelandic manuscripts preserve major narrative corpora in Christian literary environments.
12th–16th centuries CE: Saxo, saga compilers, Baltic chroniclers, and later antiquarians systematize or reinterpret older material.