Question: Who ordered the execution of Fadilla's sister?
Context: Gaia is a 2003 album by Spanish folk metal band Mägo de Oz.  It is the first rock opera of a trilogy.  The album tells of a woman, the reincarnation of Azzak (or Gaia), who after his execution, is relieved of his soul: the soul of Azzak.  Gaia, now free of her mortal skin, uses an e-mail to converse with the man who ordered her execution and tells him the story of Azzak and her affair in Colonial times.  Upon his finishing the e-mail, she appears before him and it is left as a cliffhanger for "" to finish. The Memoirs of Lady Hyegyeong is an autobiographical manuscript written by Lady Hyegyeong of Joseon that details her life during the years she was confined to Changgyeong Palace.  The Memoirs of Lady Hyegyong, or its direct translation Records Written in Silence (Korean: Hanjungnot), is a collection of four autobiographical memoirs written by Lady Hyegyong (6 August 1735 – 13 January 1816), also known as Queen Heongyeong of the Choson Dynasty.  The Memoirs of Lady Hyegyong consist of four memoirs that were written within a ten year period from 1795 to 1805, depicting Lady Hyegyong’s life before and after being chosen to marry Crown Prince Sado.  Perhaps most famously, the memoirs discuss Crown Prince Sado’s descent into violent madness until his execution was ordered by his father, King Yongjo.  Although Lady Hyegyong’s descriptions of her husband’s madness and execution are the most famous parts of her collection, each of Lady Hyegyong’s four memoirs center around a different aspect of her life and have a different political purpose. Annia Aurelia Fadilla, most commonly known as Fadilla (159-died after 211) was an influential Roman Princess and was one of the daughters born to Roman Emperor Marcus Aurelius and Roman Empress Faustina the Younger.  She was a sister to Roman Empress Lucilla and Roman Emperor Commodus.  Fadilla was named in honor of her late maternal aunt Aurelia Fadilla.  The cognomen Fadilla, was the cognomen of the mother and a half-sister of the previous Roman Emperor Antoninus Pius.  Her maternal grandparents were Roman Emperor Antoninus Pius and Roman Empress Faustina the Elder and her paternal grandparents were Domitia Lucilla and praetor Marcus Annius Verus. Marcus Peducaeus Plautius Quintillus (died 205) was a Roman noble closely related by birth, adoption, and marriage to the Nerva-Antonine emperors.  Through his marriage to Fadilla, the daughter of Emperor Marcus Aurelius and Empress Faustina the Younger, he became the brother-in-law to the future emperor, Commodus.  Despite his position, he never became emperor himself.  After Commodus was assassinated in 192, he fell out of favor with Septimus Severus during the Year of the Five Emperors.  In 205, he committed suicide after Septimus issued an order for his execution. Jehosheba (alternately Jehoshebeath) (Hebrew: יְהוֹשֶׁ֫בַע‎ ‎ "Yehosheba", "the LORD is an oath"), or Josaba, is a figure in the Hebrew Bible.  She was the daughter of King Jehoram of Judah, sister to King Ahaziah of Judah and wife of Jehoiada the priest.  She was a daughter of Jehoram, but not necessarily of Athaliah.  After the death of Ahaziah, his mother, Athaliah, made herself Queen of Judah and ordered the execution of all members of the royal family that could claim the throne.  However, according to 2 Kings , Jehosheba saved from the massacre her infant nephew Jehoash, Ahaziah's son and Athaliah's grandson: Annia Aurelia Galeria Lucilla or Lucilla (March 7, 148 or 150–182) was the second daughter and third child of Roman Emperor Marcus Aurelius and Roman Empress Faustina the Younger and an elder sister to future Roman Emperor Commodus.  Commodus ordered Lucilla's execution after a failed assassination and coup attempt when she was about 33 years old. The Pinsk massacre was the mass execution of thirty-five Jewish residents of Pinsk on April 5, 1919 by the Polish Army.  The event occurred during the opening stages of the Polish-Soviet War, after the Polish Army had captured Pinsk.  The Jews who were executed had been arrested whilst engaged in an illegal gathering presumably of a Bolshevik cell.  The Polish officer-in-charge ordered the summary execution of the meeting participants without trial in fear of a trap, and based on the information about the gathering's purpose that was founded on hearsay.  The officer's decision was defended by high-ranking Polish military officers, but was widely criticized by international public opinion. George Corwin (February 26, 1666 – April 12, 1696) was the High Sheriff of Essex County, Massachusetts during the Salem witch trials, which he signed warrants for the arrest and execution of those condemned of witchcraft.  Corwin was also responsible for choosing the execution site in Salem for the 19 innocent people hanged.  On September 16, 1692, he was ordered by the Court of Oyer and Terminer to preside over the interrogation under torture of Giles Corey, who was pressed to death for refusing to stand trial for witchcraft. Republican marriage (French: mariage républicain ) was a method of execution that allegedly occurred in Nantes during the Reign of Terror in Revolutionary France and "involved tying a naked man and woman together and drowning them".  This was reported to have been practised during the drownings at Nantes ("noyades") that were ordered by local Jacobin representative-on-mission Jean-Baptiste Carrier between November 1793 and January 1794 in the city of Nantes.  Most accounts indicate that the victims were drowned in the Loire River, although a few sources describe an alternative means of execution in which the bound couple is run through with a sword, either before, or instead of drowning. The Nerbudda incident was the execution of 197 personnel of the British transport ship "Nerbudda" and brig "Ann" in southern Taiwan, on 10 August 1842 during the First Opium War.  An additional 87 prisoners died from ill-treatment in captivity.  In September 1841, the "Nerbudda" became shipwrecked off the northern Taiwan near Keelung.  In March 1842, the "Ann" also became shipwrecked in central Taiwan near Tai An Harbour.  Survivors from both ships were captured and marched south to the capital of Taiwan Prefecture, where they were imprisoned before being beheaded on 10 August.  Out of the nearly 300 who landed in Taiwan, 11 survived captivity and execution.  The Daoguang Emperor ordered the execution on 14 May 1842, after the Chinese defeat in Zhejiang.
Answer: Roman Emperor Commodus