Question: Prominent Imam, Shakeel Begg attempted to secure release of a British taxi driver who became what number of Western hostage killed by the Islamic State? 

Context paragraphs:
Percy Toplis: Francis Percy Toplis (20 August 1896 – 6 June 1920) was a British criminal and imposter active during and after the First World War.  Before the war he was imprisoned for attempted rape.  During the war he served as a private in the Royal Army Medical Corps, but regularly posed as an officer while on leave, wearing a monocle.  After the war he became notorious following the murder of a taxi driver and the wounding of a police officer who attempted to apprehend him.  The subsequent manhunt was major news at the time.  He was tracked down and killed in a gunfight with police.

Toʻylar muborak: After traffic police stop Yunus and his friends who are slightly drunk, he takes a taxi and leaves his friends behind.  The taxi driver gets dizzy and crashes the car.  Yunus, despite being in a hurry to attend his own wedding, takes the taxi driver to hospital.  When he gets out of the hospital, a couple begs him to take them in "his taxi" to some place.  Everyone thinks Yunus is a taxi driver and he finds it increasingly difficult to refuse to take people to places.

Abdul Rahim Ghafoorzai: Abdul Rahim Ghafoorzai (d. August 21, 1997) was a politician and diplomat of Afghanistan.  He was an ethnic Pashtun, a member of the Barakzai Mohammadzai tribe.  During the 1970s he entered the Afghan foreign service.  He was sent to the United States to represent the political administration supported by the Soviet Union.  As the Ambassador to the UN, Mr. Ghafoorzai thought it his duty to call on the global partners to denounce the Soviet invasion in 1979.  From then until 1992, he worked as a representative official to trigger international support against the regime that the Soviets had set up in Afghanistan.  When the communist government fell in 1992, Ghafoorzai acted as an intermediary to unite the factions of Afghanistan.  He worked in the United Nations until 1995, and then became deputy foreign minister.  He became foreign minister in July 1996.  in September 1996 the government troops withdrew from Kabul and the Taliban captured Afghanistan's capital, Kabul, The International community did not recognize the Taliban as Afghanistan legitimate government except Pakistan, United Arab Emirates and Saudi Arabia, the Islamic State of Afghanistan government established the new cabinet in Mazar e Sharif in the north of Afghanistan, meanwhile the Afghanistan Embassies and the Permanent Mission of Afghanistan to the United Nations was in control of Islamic State of Afghanistan as legitimate representative of Afghanistan.  Ghafoorzai continued as Afghanistan Foreign Minister until August 11, 1997, just 10 days before his death, he was appointed prime minister of the Islamic State of Afghanistan government.  He was killed in a plane crash in Bamyan Province when he was going to negotiate to form his cabinet with their allies.

Alan Henning: Alan Henning (15 August 1967 – c. 3 October 2014) was an English taxicab driver-turned-volunteer humanitarian aid worker.  He was the fourth Western hostage killed by Islamic State of Iraq and the Levant (ISIL) whose killing was publicised in a beheading video.

Dur al-Manthur: Al-Durr Al-Manthur Fi Tafsir Bil-Ma'thur (Arabic: الدر المنثور في التفسير بالماثور‎ , 'The Scattered Pearls: Intertextual Exegesis' ‎ ) is an Sunni tafsir (exegesis or commentary of the Qur'an, the holy book of Islam) recognized as authoritative, written by the prominent Imam Jalal al-Din al-Suyuti (d. 911 AH (1505 AD), who also co-wrote the "Tafsir al-Jalalayn".  The exegesis explains each passage of the Qur'an by the reports and narrations from the Islamic prophet Muhammad, his Companions and the immediate generations following the Companions.  Suyuti compiled all the reports and narrations that he could gather for each particular passage - even contradictory reports, as can be seen in the narrations gathered explaining verse 33:33:

Shakeel Begg: Shakeel Begg has been Imam at the influential Lewisham Islamic centre in London UK since 1998, and has played a prominent role in the UK Muslim community, and has been invited to speak at many Mosques and Islamic events, and been a spokesman for the Muslim community in many events and press releases: including high-profile attempts to secure the release by ISIS of British hostage Alan Henning.

Mark McGowan (performance artist): Mark McGowan (born 9 June 1964) is a British street artist, performance artist and prominent public protester who has gone by the artist name Chunky Mark and more recently The Artist Taxi Driver.  By profession, McGowan is a London taxi driver and occasional University speaker and arts tutor.  McGowan is known internationally for his performance art including shock art, street art and installation art, and as a stuntman, internet personality, video blogger, social commentator, social critic, satirist, political activist, peace activist, and an anti-establishment, anti-war, anti-capitalist anti-monarchist and anti-power elite protester.

Genocide of Yazidis by ISIL: The Islamic State of Iraq and the Levant (ISIL, calling itself Islamic State) is recognized by the UN as the perpetrator of a genocide of Yazidis in Iraq.  The genocide has led to the expulsion, flight and effective exile of the Yazidis from their ancestral lands in Northern Iraq.  The genocide led to the abduction of Yazidi women and massacres that killed thousands of Yazidi civilians during what has been called a "forced conversion campaign" being carried out in Northern Iraq by the Islamic State of Iraq and the Levant (ISIL or ISIS), starting in 2014.

Imams in Ibadan: The history of Islam in the ancient city of Ibadan can be traced to as far back as early 19th century that as at 1830 the city was full of Muslims of Yoruba and Hausa origin.  Islamic activities thus sprang up in at this initial stage though in its low ebb.  Mosques were later built individually and collectively and Islamic scholars, who later became prominent Imam also migrated to the city.  The actual time for the beginning of Islam have not been ascertained by the historian.  However, as at 1839 mosque was found in the central Ibadan with its first Imam Shaykh Abdullah Igun Olohun.

Cai Mingjie: Cai Mingjie (蔡明杰, born 1952) is a Singaporean taxicab driver and former biology researcher, known for his blog, "A Singapore Taxi Driver's Diary".  He is described variously as "Singapore's most educated taxi driver" and "the only taxi driver with a Ph.D.".

Supporting paragraphs: Shakeel Begg Alan Henning
Answer: the fourth