In the poem , PERSON@1 , a hero of the Geats , battles three antagonists : PERSON@2 , who has been attacking the resident warriors of a mead hall called LOCATION@1 in LOCATION@2 ; Grendel 's mother ; and an unnamed dragon .

In the poem , PERSON@1 fights three monsters : Grendel and PERSON@2 's mother , and later in his life an unnamed dragon .
