Question: What is the name of Hassan Khomeini's grandfather

Context paragraphs:
National Anthem of the Islamic Republic of Iran: The "National Anthem of the Islamic Republic of Iran" (Persian: سرود ملی جمهوری اسلامی ایران‎ ‎ ) was composed by Hassan Riyahi, with words written by Aiadan Maroni.  This anthem was adopted in 1990, replacing the anthem used during the time of Ayatollah Khomeini, called "Payandeh Bada Iran".

Khomeini (name): Khomeini is an Iranian name, derived from the Iranian city of Khomein.  The "i" at the end means that the person is from the said city.  The most prominent Khomeini is Ruhollah Khomeini.

Basij: The Basij (Persian: بسيج‎ ‎ , lit.  "The Mobilization"), Niruyeh Moghavemat Basij (Persian: نیروی مقاومت بسیج‎ ‎ , "Mobilisation Resistance Force"), full name Sāzmān-e Basij-e Mostaz'afin (Persian: سازمان بسیج مستضعفین‎ ‎ , "The Organization for Mobilization of the Oppressed"), is one of the five forces of the Islamic Revolutionary Guard Corps.  A paramilitary volunteer militia established in Iran in 1979 by order of Ayatollah Khomeini, leader of the Iranian Revolution, the organization originally consisted of civilian volunteers who were urged by Khomeini to fight in the Iran–Iraq War.

Hassan Khomeini: Hassan Khomeini (born 23 July 1972, Persian: سيد حسن خمينی‎ ‎ ) is an Iranian cleric.  He has been called "the most prominent" grandchild of Ruhollah Khomeini, who had 15 grandchildren in total and the one "who many think could have a promising political future".

Ruhollah Khomeini: Sayyid Ruhollah Mūsavi Khomeini (Persian: سید روح‌الله موسوی خمینی‎ ‎ ] ; 24 September 1902 – 3 June 1989), known in the Western world as Ayatollah Khomeini, was an Iranian Shia Muslim religious leader, philosopher, revolutionary, and politician.  He was the founder of the Islamic Republic of Iran and the leader of the 1979 Iranian Revolution that saw the overthrow of the 2500 years of Persian monarchy and Mohammad Reza Pahlavi, the last Shah of Iran.  Following the revolution, Khomeini became the country's Supreme Leader, a position created in the constitution of the Islamic Republic as the highest-ranking political and religious authority of the nation, which he held until his death.  He was succeeded by Ali Khamenei on 4 June 1989.

Ali Khamenei: Sayyid Ali Hosseini Khamenei (Persian: سید علی حسینی خامنه‌ای‎ ‎ ] ; born 17 July 1939) is a "marja" and the second and current Supreme Leader of Iran.  Khamenei succeeded the first Supreme Leader, Ruhollah Khomeini, after Khomeini's death, being elected as the new Supreme Leader by the Assembly of Experts on 4 June 1989 at the age of 49.  His political career began after the Iranian Revolution, when the former President of Iran, Akbar Hashemi Rafsanjani, then a confidant of Khomeini, brought Khamenei into Khomeini's inner circle.  Later on, the current President of Iran, Hassan Rouhani, then a member of Parliament, arranged for Khamenei to get his first major post in the provisional revolutionary government as deputy defense minister.  Khamenei then went to serve as the third President of Iran from 1981 to 1989 while becoming a close ally to Khomeini.  Eventually, after Khomeini had a fall off with then heir-apparent Hussein Ali Montazeri, Rafsanjani claimed that Khomeini had chosen Khamenei as his successor while the Assembly of Experts deliberated to elect the next Supreme Leader.  Khamenei is head of the servants of Astan Quds Razavi from April 14, 1979.

Ahmad Khomeini: Sayyid Ahmad Khomeini (Persian: سید احمد خمینی‎ ‎ ;‎ 15 March 1946 – 16 March 1995) was the younger son of Ayatollah Ruhollah Khomeini and father of Hassan Khomeini.  He was the "right-hand" of his father before, during and after the revolution of Iran.  He was a link between Ruholah Khomeini and officials and people.  He had several decision-making positions.

Dawud Salahuddin: Dawud Salahuddin, sometimes spelled Daoud Salahuddin (also known as Hassan Abdulrahman or Hassan Tantai) is an American convert to Islam who in 1980 killed Ali Akbar Tabatabai, an Iranian dissident and critic of Ruhollah Khomeini, and is in exile in the Islamic Republic of Iran.  He shot Tabatabai at his home in Bethesda, Maryland, posing as mailman in the last known successful Iranian assassination plot on U.S. soil.  He is the last person known to have seen Robert Levinson, an FBI agent who has been missing since 2007.

Abdul Karim Haghshenas: On request from the mosque and place of Ayatollah Boroujerdi, Abdul Karim Haghshenas ordered them to solve the problems of religious and legal affairs of the mosque, in Tehran's departure.  Ayatollah Haghshenas said: "I was very expensive to return to Tehran, Qom scientific and practical progress was the place for me and I had no desire to come to Tehran.  He was the last difficult days.  "He is to consult with Ayatollah Ruhollah Khomeini that he hears:" The task is to go.  "She asks:" Why do not you go?  "Khomeini says:" I swear if my grandfather had told Ruhollah to come, I I was going."  Haghshenas until death finally came to Tehran and teaches courses in ethics and religious affairs, youth, students and shopkeepers were busy.  He is also the head of the old generalissimo (martyr Beheshti) and Fylsvfaldvlh school where he taught and failure Makasib was engaged in Islamic teachings and wisdom Sabzevari system.

Mausoleum of Ruhollah Khomeini: The Mausoleum of Ayatollah Khomeini houses the tomb of Ruhollah Khomeini and his family—his wife Khadijeh Saqafi and his second son Ahmad Khomeini—and some political figures, such as former President Akbar Hashemi Rafsanjani, former Vice President Hassan Habibi, Lieutenant General Ali Sayad Shirazi, Iranian Revolution figure Sadeq Tabatabaei, and MP Marzieh Hadidchi.  It is located to the south of Tehran in the Behesht-e Zahra (the Paradise of Zahra) cemetery.  Construction commenced in 1989 following Khomeini's death on June 3 of that year.  It is still under construction, but when completed will be the centerpiece in a complex spread over 20 km2 , housing a cultural and tourist center, a university for Islamic studies, a seminary, a shopping mall, and a 20,000-car parking lot.  The Iranian government has reportedly devoted US$2 billion to this development.

Supporting paragraphs: Hassan Khomeini Ruhollah Khomeini
Answer: Ruhollah Khomeini