Question: Who is the British counterpart of the man who wrote "Semper Fidelis" in 1888?

Context articles: Semper Fidelis (album)
Jennie Carter
Clayton Thorson
Semper Fidelis (march)
Semper fi (disambiguation)
John Philip Sousa
Semper Gumby
Kapiti College
Semper fidelis
Semper Fidelis (Jericho)

Semper Fidelis (Latin for "forever faithful") is the fifth full-length release of the black metal band Nargaroth.
 It marks Wagner's departure from the Black Metal scene and from his "Kanwulf" persona, and the embrace of "Ash", which has been his nickname since childhood.
Jennie Carter (c. 1830 – August 1881) was an American journalist and essayist who wrote for the California African-American newspaper "The Elevator" from her home in Nevada County, California during the Reconstruction Era.
 She used the pen name Anna J. Trask and later Semper Fidelis.
 Her work covered diverse topics, including slavery, racism, women's suffrage, temperance, politics, and immigration, and was widely circulated in late 19th century black communities throughout the American West and to some extent, nationwide.
 In the 21st century, with the republication of her essays, her work began to receive wider attention.
Clayton James Thorson is an American football quarterback.
 He is currently a redshirt junior and the starting quarterback for the 2017 Northwestern Wildcats football team.
 After redshirting in 2014, he was named the starting quarterback in 2015 and led the Wildcats to the third 10-win season in program history.
 As a starter for the 2016 team, he earned Academic All-Big Ten honors.
 Thorson was selected by ESPN.com as the seventh best high school quarterback and played in the 2014 Semper Fidelis All-American Bowl.
"Semper Fidelis", written in 1888 by John Philip Sousa (The March King), is regarded as the official march of the United States Marine Corps.
 This piece was one of two composed in response to a request from United States President Chester Arthur for a new piece to be associated with the United States President.
 The words Semper Fidelis are Latin for "Always Faithful."
Semper fi is a shortened form of the Latin phrase "semper fidelis".
John Philip Sousa ( ; ; November 6, 1854 – March 6, 1932) was an American composer and conductor of the late Romantic era, known primarily for American military and patriotic marches.
 Because of his mastery of march composition, he is known as "The March King", or the "American March King" due to his British counterpart Kenneth J. Alford also being known by the former nickname.
 Among his best-known marches are "The Stars and Stripes Forever" (National March of the United States of America), "Semper Fidelis" (Official March of the United States Marine Corps), "The Liberty Bell" (used as the theme for Monty Python's Flying Circus), "The Thunderer" and "The Washington Post".
Semper Gumby is an unofficial motto for the United States Marine Corps, United States Coast Guard, United States Public Health Service Commissioned Corps, Navy submariners, Navy Seabees, Army Unit Supply Specialists, and the Civil Air Patrol.
 It is a play on the official motto "Semper Fidelis", usually abbreviated "Semper Fi", which means ""Always Faithful"", and that of the US Coast Guard, "Semper Paratus", meaning ""Always Ready.""
 "Semper Gumby", referring to the animated clay character Gumby, means ""Always Flexible"".
 The real Latin phrase meaning ""always flexible"" is "semper flexibilis".
Kāpiti College is situated at Raumati Beach on the Kāpiti Coast in New Zealand, 40 minutes drive from central Wellington.
 It was called Raumati District High School when built in 1954, then renamed Kapiti College in 1957.
 The Kapiti College motto is "Semper Fidelis".
Semper fidelis is a Latin phrase that means "always faithful" or "always loyal".
 It is the motto of the United States Marine Corps usually shortened to Semper fi.
 It is also in use as a motto for towns, families, schools, and military units.
"Semper Fidelis" is the fifteenth episode of season one of the CBS drama "Jericho".
 The episode's title, Latin for "always faithful", is the motto of the United States Marine Corps.