Question: What ancient Lombardic king, used by J. R. R. Tolkien, has a grandson named Beowa?

Context paragraphs:
The Lord of the Rings: A Reader's Companion: The Lord of the Rings: A Reader's Companion (2005) is a nonfiction book written by scholars Wayne G. Hammond and Christina Scull.  It is an annotated reference to J. R. R. Tolkien's "The Lord of the Rings".  Hammond and Scull proceed chapter-by-chapter from the original foreword through to the end of "The Lord of the Rings".  Appendices, examining the evolution of the text, changes, inconsistencies, and errors, often using comments from Tolkien's own notes and letters.  Other sections cover the numerous maps of Middle-earth, chronologies of the story and its writing, and notes on the book and jacket design of the first editions of 1954-55.  The book includes some previously unpublished material by Tolkien.  It also reprints part of a 1951 letter in which Tolkien explicates, at some length, his conception and vision of "The Lord of the Rings".  Reprinted for the first time since 1980, and corrected and expanded, is Tolkien's "Nomenclature of The Lord of the Rings" (previously referred to as "Guide to the Names in The Lord of the Rings"), an index of persons, places, and things designed to aid the translator in rendering Tolkien's work into foreign languages.  It is available in both hardcover and paperback.

Thorin Oakenshield: Thorin II Oakenshield, son of Thráin, son of Thrór, King under the Mountain is a fictional character in J. R. R. Tolkien's 1937 novel "The Hobbit".  Thorin is the leader of the Company of Dwarves who aim to reclaim the Lonely Mountain from Smaug the dragon.  He is the son of Thráin II, grandson of Thrór, and becomes King of Durin's Folk during their exile from Erebor.  Thorin's background is further elaborated in Appendix A of Tolkien's 1955 novel "The Return of the King".

The Letters of J. R. R. Tolkien: The Letters of J. R. R. Tolkien is a selection of J. R. R. Tolkien's letters published in 1981, edited by Tolkien's biographer Humphrey Carpenter assisted by Christopher Tolkien.  The selection contains 354 letters, dating between October 1914, when Tolkien was an undergraduate at Oxford, and 29 August 1973, four days before his death.

Beowa: Beowa, Beaw, Bēow ] , Beo or Bedwig is a figure in Anglo-Saxon paganism associated with barley and agriculture.  The figure is attested in the Anglo-Saxon royal genealogies as they were extended in the age of Alfred, where Beowa is inserted as the son of Scyld and the grandson of Sceafa, in lineages carried back to Adam.  Connections have been proposed between the figure of Beowa and the hero Beowulf of the poem of the same name and English folk song figure John Barleycorn.

Tolkien Estate: The Tolkien Estate is the legal body which manages the property of the English writer J. R. R. Tolkien, including the copyright for most of his works.  The individual copyrights have for the most part been assigned by the Estate to subsidiary entities such as the J. R. R. Tolkien Discretionary Settlement and the Tolkien charitable Trust.  The various holdings of the Tolkien family, including the Estate, have been organised under The Tolkien Company, the directors of which are Christopher Tolkien, his wife Baillie Tolkien, and J. R. R. Tolkien's grandson Michael George Tolkien.  The executors of the Estate proper are Christopher Tolkien, who is sole literary executor, and (succeeding J. R. R. Tolkien's lawyer Frank Williamson) Cathleen Blackburn of Maier Blackburn, who has also been the Estate's solicitor for many years.

Sceafa: Sceafa (Old English: "Scēafa" ] , also spelled "Scēaf", "Scēf") was an ancient Lombardic king in English legend.  According to his story, Sceafa appeared mysteriously as a child, coming out of the sea in an empty boat.  The name also appears in the corrupt forms "Seskef", "Stefius", "Strephius", and "Stresaeus".  Though the name has historically been modernized Shava (and Latinized Scefius), J. R. R. Tolkien used the modern spelling "Sheave".

Dagor Dagorath: The Dagor Dagorath (Sindarin for "Battle of Battles") is a fictional battle described in the legendarium of J. R. R. Tolkien.  As Tolkien's works were conceived as a fictional "forgotten history" of the world, the Dagor Dagorath represents the coming End of the World, and is often referred to as simply "The End".  As Tolkien originally wrote it, "The Silmarillion" ends with a prophecy by Mandos about the end of the world.  The published "Silmarillion" ends instead with the last paragraph of Valaquenta.  This was because Tolkien had abandoned the idea of the "second prophecy of Mandos", and the Valaquenta text, much later, contradicted it openly.  However, references to the final battle remain in the published "Silmarillion", such as a statement at the end of the Akallabêth that Ar-Pharazôn and his mortal warriors who had set foot on Aman were buried by falling hills, imprisoned in the Caves of the Forgotten until the "Last Battle and Day of Doom".  Christopher Tolkien sees the account as similar to the Nordic legend of Ragnarök and J. R. R. Tolkien also made this connection in some of his letters.

Eucatastrophe: Eucatastrophe is a term coined by English writer J. R. R. Tolkien which refers to the sudden turn of events at the end of a story which ensures that the protagonist does not meet some terrible, impending, and very plausible and probable doom.  Tolkien formed the word by affixing the Greek prefix "eu", meaning "good", to "catastrophe", the word traditionally used in classically inspired literary criticism to refer to the "unraveling" or conclusion of a drama's plot.  For Tolkien, the term appears to have had a thematic meaning that went beyond its literal etymological meaning in terms of form.  In his definition as outlined in his 1947 essay "On Fairy-Stories", eucatastrophe is a fundamental part of his conception of mythopoeia.  Though Tolkien's interest is in myth, it is also connected to the gospel; Tolkien calls the Incarnation of Christ the eucatastrophe of "human history" and the Resurrection the eucatastrophe of the Incarnation.

Tolkien family: The Tolkien family is an English family whose best-known member is J. R. R. Tolkien, Oxford academic and author of the fantasy books "The Hobbit", "The Lord of the Rings" and "The Silmarillion".  According to J. R. R. Tolkien, the family emigrated from Lower Saxony in Germany to England in the 18th century.  The Tolkien name, with different spellings, is also still found in Germany.  The name was possibly derived from the village of Tolkynen near Rastenburg, East Prussia (now in Poland and known as Tołkiny).

The Etymologies (Tolkien): The Etymologies is an etymological dictionary of the constructed Elvish languages, written during the 1930s by J. R. R. Tolkien.  It was edited by Christopher Tolkien and published as the third part of "The Lost Road and Other Writings", the fifth volume of the History of Middle-earth.  Christopher Tolkien described it as "a remarkable document."  It is a list of roots of the Proto-Elvish language, from which J. R. R. Tolkien built his many Elvish languages, especially Quenya, Noldorin and Ilkorin.

Supporting paragraphs: Beowa Sceafa
Answer: Sceafa