Question: Are both King Roger and The Devils of Loudun operas?

Context articles: The Devils (film)
King Roger
Tancred, King of Sicily
Roger III, Duke of Apulia
The Devils of Loudun (opera)
Tabula Rogeriana
The Devils (play)
The Devils of Loudun
Ruggero Settimo
Philip of Mahdia

The Devils is a 1971 British historical drama horror film directed by Ken Russell and starring Oliver Reed and Vanessa Redgrave.
 Russell's screenplay is based partly on the 1952 book "The Devils of Loudun" by Aldous Huxley, and partly on the 1960 play "The Devils" by John Whiting, also based on Huxley's book.
King Roger (Polish: "Król Roger" , Op.
 46) is an opera in three acts by Karol Szymanowski to a Polish libretto by the composer himself and Jarosław Iwaszkiewicz, the composer's cousin.
 The opera received its world premiere on 19 June 1926 at the Grand Theatre, Warsaw, with the cast including the composer's sister, the soprano Stanisława Korwin-Szymanowska, as Roxana.
Tancred (1138 – 20 February 1194) was King of Sicily from 1189 to 1194.
 He was born in Lecce an illegitimate son of Roger III, Duke of Apulia (the eldest son of King Roger II) by his mistress Emma, a daughter of Achard II, Count of Lecce.
 He inherited the title "Count of Lecce" from his grandfather and is consequently often referred to as "Tancred of Lecce".
 Due to his short stature and unhandsome visage, he was mocked by his critics as "The Monkey King".
Roger III (1118 – 2 or 12 May 1148) was the eldest son of King Roger II of Sicily and Elvira of Castile.
 He was the Duke of Apulia from 1134 until his death.
Die Teufel von Loudun ("The Devils of Loudun") is an opera in three acts written in 1968 and 1969 by Polish composer Krzysztof Penderecki, and then revised in 1972 and 1975.
 It has a German libretto by the composer, based on John Whiting's dramatization of Aldous Huxley's novel of the same name.
The Nuzhat al-mushtāq fi'khtirāq al-āfāq (Arabic: نزهة المشتاق في اختراق الآفاق‎ ‎ , lit.
 "the book of pleasant journeys into faraway lands"), most often known as the Tabula Rogeriana (lit.
 "The Book of Roger" in Latin), is a description of the world and world map created by the Arab geographer, Muhammad al-Idrisi, in 1154.
 Al-Idrisi worked on the commentaries and illustrations of the map for fifteen years at the court of the Norman King Roger II of Sicily, who commissioned the work around 1138.
The Devils is a play, commissioned by Sir Peter Hall for the Royal Shakespeare Company and written by British dramatist John Whiting, based on Aldous Huxley's book, "The Devils of Loudun".
The Devils of Loudun is a 1952 non-fiction novel by Aldous Huxley.
 It is a historical narrative of supposed demonic possession, religious fanaticism, sexual repression, and mass hysteria that occurred in seventeenth-century France surrounding unexplained events that took place in the small town of Loudun.
 It centers on Roman Catholic priest Urbain Grandier and an entire convent of Ursuline nuns, who allegedly became possessed by demons after Grandier made a pact with Satan.
 The events led to several public exorcisms as well as executions by burning.
Ruggero Settimo (19 May 1778 – 12 May 1863) was an Italian politician, diplomat, and patriotic activist from Sicily.
 The name means "Roger the Seventh", from a family name originating in Pisa (Tuscany).
 He was a counter-admiral of the Sicilian Fleet.
 He fought alongside the British fleet in the Mediterranean Sea against the French under Napoleon Bonaparte.
 He reconquered the island of Malta, and defended the city of Gaeta near Naples.
 In 1811 he had to retire from the military to health problems.
 He was a member of the Sicilian government of Prince Castelnovo in 1812 as Minister of the merchant navy.
 Was a member of the revolutionary junta of 1820-1821 and in 1848 as president of the Sicilian Senate was appointed as Chief of the government of the Kingdom of Sicily and led the Sicilian government until 1849.
 His family was in legacy for marriage with the last heir of the family Calvello (about 1468), so became proprietary of one of the largest estates in Sicily.
 With his father Trajan Settim Aversa the feud (fief) was given the title of the Principality of Fitalia.
 The fief was formed in 1130 after the investiture of King Roger II King of Sicily.
 King Roger gifted this fief to the husband of the woman who nursed him and his brother Simon.
Philip of Mahdia, of Greek origin, was the emir of Palermo, and successor of the great George of Antioch.
 He was a eunuch who rose through the ranks of the royal "curia" in Palermo until he was eventually one of King Roger II's most trusted men.
 On George's death in year 546 of the Hegira (AD 1151 or 1152), Roger appointed him to the highest post in the kingdom.