Question: How many alliteratve lines does the poem, that the bar Grendel's Den references in it's name, have?

Context articles: Beowulf
Grendel's mother
Den mörka sanningen
Unferð
Æschere
List of artistic depictions of Grendel's mother
Triolet
Darkness (poem)
Den Store Danske Encyklopædi
Grendel's Den

Beowulf ( ] ) is an Old English epic poem consisting of 3,182 alliterative lines.
 It may be the oldest surviving long poem in Old English and is commonly cited as one of the most important works of Old English literature.
 A date of composition is a matter of contention among scholars; the only certain dating pertains to the manuscript, which was produced between 975 and 1025.
 The author was an anonymous Anglo-Saxon poet, most likely from the Kingdom of Northumbria, referred to by scholars as the ""Beowulf" poet".
Grendel's mother (Old English: "Grendles mōðor" ) is one of three antagonists in the anonymous Old English poem "Beowulf" (c. 700–1000 AD).
 The other antagonists are Grendel and the dragon, all aligned in opposition to the hero Beowulf.
 She is introduced in lines 1258b to 1259a as: "Grendles modor/ides, aglæcwif."
Den mörka sanningen - En berättelse om kärlek och omsorg, svek och mod (Swedish: "The Dark Truth - A Story About Love and Care, Fraud and Gallantry") is a love- and crime novel by Norwegian-Swedish author Margit Sandemo from 2001.
 Forerunner of this novel is a serial in a magazine published short novel called "Sanningen" (Swedish: "The Truth").
 The clue and characters of "Sanningen" are same as in the "Den mörka sanningen", it's just the extended version from that story.
 "Den mørke sannheten" is the novel's Norwegian name.
 In Norway "Den mörka sanningen" has published as part of "Spesial bøker" (Special Books) -series, which is assembled of novels by many writers.
 Norwegian translation is by Unni Wenche Tandberg.
In the Old English epic poem "Beowulf", Unferth or Hunferth is a thegn (a retainer, servant) of the Danish lord Hrothgar.
 His name appears four times in the poem (always spelled Hunferð), at lines 499, 530, 1165, and 1488, as well as in line 980 by the appellation "the son of Eclafes".
 The name "Unferth" does not appear in any Old English manuscript outside of the Nowell Codex, which contains "Beowulf", and the meaning of the name is disputed.
 Several scholarly theories about Unferth have been proposed.
 Unferth is also the name of a character in the modern novel "Grendel" by John Gardner, based upon the "Beowulf" epic.
In the Anglo-Saxon epic Beowulf, Æschere is Hrothgar's most trusted advisor who is killed by Grendel's mother in her attack on Heorot after Grendel's death.
 His name is composed of the Germanic elements Æsc, meaning 'ash', and here, meaning 'army'.
 King Hrothgar describes Æschere as 'min runwita ond min rædbora' (1325), which implies that he knows mysteries or enigmas and also has a duty to explain those mysteries aloud to a community.
 But by killing and decapitating Æschere, Grendel's mother highlights an anxiety within the poem about things that defy human interpretation.
 Beowulf and his Geatish warriors find Æschere's severed head at the entrance to Grendel's mother's lair.
This list of artistic depictions of Grendel's mother (Old English: Grendles modor) refers to the figure of Grendel's mother.
 She is one of three antagonists (along with Grendel and the dragon) in the Anglo-Saxon epic poem "Beowulf" (c. 700 – 1000 AD); she is never given a name in the text.
A triolet ( or ) is almost always a stanza poem of eight lines, though stanzas with as few as seven lines and as many as nine or more have appeared in its history.
 Its rhyme scheme is "ABaAabAB" and in 19th century English triolets often all lines are in iambic tetrameter, though in traditional French triolets from the 17th century on the second, sixth and eighth lines tend to be iambic trimeters followed by one amphibrachic foot each.
 In French terminology, a line ending in an iambic foot was denoted as masculine, while a line ending in an amphibrachic foot was called feminine.
 Depending on the language and era, other meters are seen, even in French.
 The first, fourth and seventh lines are identical, as are the second and final lines, thereby making the initial and final couplets identical as well.
 In a traditional French triolet, the second and third non-repeating lines rhyme with the repeating first, fourth, and seventh lines, while the non-repeating sixth line rhymes with the second and eighth repeating lines.
 However, especially in German triolets of the 18th and 19th centuries, one will see this pattern often violated.
"Darkness" is a poem written by Lord Byron in July 1816.
 That year was known as the Year Without a Summer, because Mount Tambora had erupted in the Dutch East Indies the previous year, casting enough sulphur into the atmosphere to reduce global temperatures and cause abnormal weather across much of north-east America and northern Europe.
 This pall of darkness inspired Byron to write his poem.
 Literary critics were initially content to classify it as a "last man" poem, telling the apocalyptic story of the last man on earth.
 More recent critics have focused on the poem's historical context, as well as the anti-biblical nature of the poem, despite its many references to the Bible.
 The poem was written only months after the end of Byron's marriage to Anne Isabella Milbanke.
Den Store Danske Encyklopædi ("The Great Danish Encyclopedia") is the most comprehensive contemporary Danish language encyclopedia.
 The 20 volumes of the encyclopedia were published successively between 1994 and 2001; a one-volume supplement was published in 2002 (Deadline:1 September 2002;656 pages) and two index volumes in 2003.
 Another one-volume supplement ("Supplement 2") was published in 2006 (Deadline:1 September 2006;632 pages).
 Supplement 2 also contained information on the new Structural Reform of the public sector, mostly in effect from 1 January 2007, i.e. maps of the new municipalities and regions.
 The work comprises 115,000 articles, ranging in size from single-line cross references to the 130-page entry "Danmark" (Denmark).
 The articles were written by a staff of about 4,000 academic experts led by editor-in-chief Jørn Lund.
 Articles longer than a few dozen lines are signed by their authors.
 Many articles are illustrated.
Grendel's Den is a bar and restaurant in Harvard Square in Cambridge, Massachusetts, located at 89 Winthrop Street.
 The establishment is frequented by both students and professors of Harvard University as well as many others from the Cambridge and Boston area.
 The name was a reference to Grendel, the antagonist in the Old English epic poem of Beowulf.