Question: Elladan and Elrohir are characters created by which English writer and poet?

Context paragraphs:
Elladan and Elrohir: Elladan and Elrohir are fictional characters in J. R. R. Tolkien's Middle-earth, the sons of Elrond Half-elven and Celebrían and older brothers of Arwen.

List of Star Trek characters (A–F): This article lists characters of "Star Trek" in their various canonical incarnations.  This includes fictional major characters and fictional minor characters created for "Star Trek", fictional characters not originally created for "Star Trek", and real-life persons appearing in a fictional manner, such as holodeck recreations.

Judgment Day (Awesome Comics): Judgment Day was a limited series published by Awesome Comics from June to October 1997 written by Alan Moore and illustrated by Rob Liefeld, with additional art by Gil Kane.  This story delved into the Awesome Comics universe of characters created by Liefeld, including "Supreme", "Youngblood" and "Glory", and deals with the concept of superheroes being tried for murder.  It also features characters created by other Image Comics creators such as Erik Larsen's Savage Dragon.

J. R. R. Tolkien: John Ronald Reuel Tolkien, ( ; 3 January 1892 – 2 September 1973) was an English writer, poet, philologist, and university professor who is best known as the author of the classic high-fantasy works "The Hobbit", "The Lord of the Rings", and "The Silmarillion".

List of Star Trek characters (N–S): This article lists characters of "Star Trek" in their various canonical incarnations.  This includes fictional major characters and fictional minor characters created for "Star Trek", fictional characters not originally created for "Star Trek", and real-life persons appearing in a fictional manner, such as holodeck recreations.

List of Angel characters: This article lists the major and recurring fictional characters created by Joss Whedon and the writers of Mutant Enemy for the cult hit television program, "Angel".  For a more in-depth look at some of the minor characters on the show, please see the list of minor "Angel" characters.  For the characters of "Angel"'s parent show "Buffy the Vampire Slayer", please see list of "Buffy the Vampire Slayer" characters and list of minor "Buffy the Vampire Slayer" characters.

Celebrían: Celebrían is a fictional character created by J. R. R. Tolkien.  She is an Elven noblewoman, the daughter of Celeborn and Galadriel, wife of Elrond, and mother of Elrohir, Elladan and Arwen.  She was called the Lady of Rivendell.  Her name means "silver crown-gift" in Sindarin (one of the languages invented by Tolkien).

List of Star Trek characters (T–Z): This article lists characters from "Star Trek" in their various canonical incarnations.  This includes fictional major characters and fictional minor characters created for "Star Trek", fictional characters not originally created for "Star Trek", and real-life persons appearing in a fictional manner, such as holodeck recreations.

King Kong vs. Tarzan: King Kong Vs. Tarzan is a 2016 novel by Will Murray, featuring the characters created by Edgar Rice Burroughs in a crossover with the characters created by Merian C. Cooper for the novelization of King Kong.  It is authorized by Burroughs' estate.

List of Star Trek characters (G–M): This article lists characters of "Star Trek" that received attention from third-party sources in their various canonical incarnations.  This includes fictional major characters and fictional minor characters created for "Star Trek", fictional characters not originally created for "Star Trek", and real-life persons appearing in a fictional manner, such as holodeck recreations.

Supporting paragraphs: Elladan and Elrohir J. R. R. Tolkien
Answer: John Ronald Reuel Tolkien