"Beowulf: A Translation and Commentary" is a book by J.R.R. Tolkien, the renowned author of "The Lord of the Rings" trilogy. It is a translation of the Old English epic poem, "Beowulf," accompanied by extensive commentary from Tolkien.

The book includes Tolkien's translation of the entire "Beowulf" poem, along with his notes and comments on the language, historical context, and literary significance of the text. The commentary provides readers with insights into the poetic style and structure of "Beowulf," as well as the cultural and historical context in which it was created.

Tolkien's translation of "Beowulf" is noteworthy for its adherence to the original Old English poetic form, which uses alliteration and stresses rather than rhyme. He sought to create a translation that captured the musicality and rhythm of the original poem, while also making it accessible to modern readers.

In his commentary, Tolkien explores the themes and motifs of "Beowulf," including heroism, honor, fate, and the nature of evil. He draws connections between "Beowulf" and other works of Anglo-Saxon literature, as well as Norse mythology and Germanic folklore.

The book also includes several appendices, which provide readers with additional background information on Old English literature and the historical context of "Beowulf." These appendices cover topics such as the history of the English language, the Anglo-Saxon chronicle, and the cultural and historical context of the poem.

Overall, "Beowulf: A Translation and Commentary" is a valuable resource for scholars and fans of J.R.R. Tolkien, as well as anyone interested in Old English literature and the history of the English language. The book provides readers with a deep understanding and appreciation of one of the most important works of Anglo-Saxon literature, while also showcasing Tolkien's skill as both a translator and literary critic.