Nannina de' Medici (14 February 1448 – 14 May 1493), born Lucrezia de' Medici, was the second daughter of Piero di Cosimo de' Medici and Lucrezia Tornabuoni.
 She was thus the elder sister of Lorenzo de' Medici.
 She married Bernardo Rucellai.
 Her father's name was Piero, so she is sometimes known as Lucrezia di Piero de' Medici.
Rashīd ad-Dīn Sinān (Arabic: رشيد الدين سینان‎ ‎ ), also known as the Old Man of the Mountain (Arabic: شيخ الجبل‎ ‎ "Shaykh al-Jabal", Latin: "Vetulus de Montanis" ) (1132/1135–1192), was a leader of the Syrian branch of the Nizari Ismaili state (the Assassins), and a figure in the history of the Crusades.
The aim of color calibration is to measure and/or adjust the color response of a device (input or output) to a known state.
 In International Color Consortium (ICC) terms, this is the basis for an additional color characterization of the device and later profiling.
 In non-ICC workflows, calibration refers sometimes to establishing a known relationship to a standard color space in one go.
 The device that is to be calibrated is sometimes known as a "calibration source"; the color space that serves as a standard is sometimes known as a "calibration target".
 Color calibration is a requirement for all devices taking an active part of a color-managed workflow.
Abu Musab al-Zarqawi (Arabic: أبو مصعب الزرقاوي‎ ‎ , "’Abū Muṣ‘ab az-Zarqāwī ", "Abu Musab from Zarqa";    ; October 20, 1966 – June 7, 2006), born Ahmad Fadeel al-Nazal al-Khalayleh (أحمد فضيل النزال الخلايلة , "’Aḥmad Faḍīl an-Nazāl al-Ḫalāyla "), was a Jordanian jihadist who ran a paramilitary training camp in Afghanistan.
 He became known after going to Iraq and being responsible for a series of bombings, beheadings, and attacks during the Iraq War, reportedly "turning an insurgency against US troops" in Iraq "into a Shia-Sunni civil war".
 He was sometimes known as "Shaykh of the slaughterers".
Khalid Mustafa Khalifa al-Aruri was born on July 25, 1967 in Ramallah on the West Bank and is a Jordanian citizen.
 He is also known by his aliases Abu al-Qassam, Abu Ashraf and Abu Jabal.
 Al-Aruri is married Alia to a sister of the late Abu Musab al-Zarqawi.
A residual-current device (RCD), or residual-current circuit breaker (RCCB), is a device that instantly breaks an electric circuit to prevent serious harm from an ongoing electric shock.
 Injury may still occur in some cases, for example if a human falls after receiving a shock.
 In the United States and Canada, the device is more commonly known as a ground fault circuit interrupter (GFCI), ground fault interrupter (GFI) or an appliance leakage current interrupter (ALCI).
 In the United Kingdom, these are better known by their initials RCD, and a combined RCD+MCB (miniature circuit breaker) is known as a RCBO (residual-current circuit breaker with overcurrent protection).
 In Australia, they are sometimes known as safety switches or an RCD.
 In Malta they are sometimes known as salvavita, from the Italian] term.
 An earth leakage circuit breaker (ELCB) may be a residual-current device, although an older type of voltage-operated earth leakage circuit breaker also exists.
Khvajeh Mohammad Safavi was a son of Shaykh Junayd, leader of the Safaviyya order (1447–1460), born by a Circassian concubine.
 He was an older (half)-brother of Shaykh Haydar, the successor of Shaykh Junayd as leader of the Safaviyya, as well as therefore the uncle of the founder of the Safavid dynasty, Ismail I.
 He had another brother named Khvajeh Jamshid, who was killed in southern Dagestan when he served during one of Shaykh Haydar's campaigns.
 Khvajeh Mohammad's only surviving sister, Shah-Pasha Khatun, was married to Mohammad Beg Talish, a military chief hailing from Khalkhal who would later become guardian ("laleh") to Ismail I and who would play a pivotal role in the ascension of Ismail to power in the early 16th century.
Díyá'u'lláh (alternate spelling: Zíyá'u'lláh) (15 August 1864 - 30 October 1898) was one of the sons of Bahá'u'lláh.
 He was the second son of his father's second wife Fatimih (also known as Mahd-i-'Ulya) He was born in Edirne (modern day Adrianople).
 Bahá'u'lláh gave the title "Ghusn-i-Athar" (meaning "Most Pure Branch" or "Purer Branch") to his son Mírzá Mihdí.
 After Mírzá Mihdí's death in 1870, Bahá'u'lláh gave the same title to his other son Díyá'u'lláh He swayed between his two brothers, `Abdu'l-Bahá and Muhammad `Alí, in their argument.
 He married Thurayyá Samandarí, daughter of Shaykh Kázim-i-Samandar and sister of Taráz’u’lláh Samandarí, a Hand of the Cause of God.
 The marriage was childless.
 Díyá'u'lláh died on 30 October 1898 in Haifa Palestine, and was posthumously labeled a Covenant-breaker.
ʿAbd al-Razzāq b. ʿAbd al-Qādir al-Jīlānī (c. Dhu al-Qi'dah 528 AH – 6 Shawwal 603 AH/9 September 1134 – 7 May 1207), also known as Abū Bakr al-Jīlī or ʿAbd al-Razzāq al-Jīlānī (often simplified as Abdul-Razzaq Gilani) for short, or reverentially as Shaykh ʿAbd al-Razzāq al-Jīlānī by Sunni Muslims, was a Persian Sunni Muslim Hanbali theologian, jurist, traditionist, and Sufi mystic based in Baghdad.
 As the son and spiritual heir of the renowned jurist and mystic Abdul-Qadir Gilani (d. 1166), the founder of the Qadiriyya order of Sunni mysticism, Abdul-Razzaq Gilani received his initial training in all the traditional Islamic sciences under his forebear, prior to setting out "on his own to attend the lectures of other prominent Hanbali scholars" in his region.
 Abdul-Razzaq is sometimes given the Arabic honorary epithet Tāj al-Dīn (Crown of the Religion) in Sunni tradition, due to his reputation as an outstanding jurisconsult and mystic of the Hanbali school.
Sari Shihab is a Jordanian national born in 1973 who was a member of the different groups that were founded by Abu Musab al-Zarqawi.
 Sari Muhammad Hasan Shihab is also known as Abu Safar and Suhayb.
 Shihab was one of five al-Qa'ida leaders who were released by Iran in March 2015 in exchange for a kidnapped Iranian diplomat in Yemen.
 The other four were Sayf al-Adl, Abu Mohammed al-Masri, Abu Khayr al-Masri and Khalid al-Aruri.

Question: Khalid al-Aruri is married to a sister of what man sometimes known as Shaykh of the slaughterers?
Answer: Abu Musab al-Zarqawi