Question: Who was the son of the ruling king of the second largest city in Afghanistan

full_context: Document 1: Vasudeva IV: Vasudeva IV was reportedly a Kushan King ruling in Kandahar. He was the possible father of Vasudeva of Kabul.
Document 2: Krishna III: Krishna III whose Kannada name was Kannara (r. 939 – 967 C.E.) was the last great warrior and able monarch of the Rashtrakuta Dynasty of Manyakheta. He was a shrewd administrator and skillful military campaigner. He waged many wars to bring back the glory of the Rashtrakutas and played an important role in rebuilding the Rashtrakuta empire. He patronised the famous Kannada poets Sri Ponna, who wrote "Shanti purana", Gajankusha, also known as Narayana, who wrote on erotics, and the Apabhramsha poet Pushpadanta who wrote "Mahapurana" and other works. His queen was a Chedi princess and his daughter Bijjabbe was married to a Western Ganga prince. During his rule he held titles such as "Akalavarsha", "Maharajadhiraja", "Parameshvara", "Paramamaheshvara", "Shri Prithvivallabha" etc. At his peak, he ruled a vast empire stretching from the Narmada river in the north to the Kaveri river delta in the south. A copper grant of 993 issued by the Shilahara king of Thana claims the Rashtrakuta control extended from the Himalayas in the north to Ceylon in the south and from the eastern sea to the western seas. The grant states that when King Krishna III mobilised his armies, the kings of Chola, Bengal, Kannauj, Andhra and Pandya regions used to quiver.
Document 3: Kharshbun: Kharshbun and Sharkhbun are brothers son of Sarban, the first son of the legendary Pashtun ancestor Qais Abdur Rashid. The Sarbani tribes, all supposed descendants of Sarban, form one of the major lineage branches of the Pashtun tribes. Kharshbun's progeny compose the Eastern Pashtuns, found primarily in Pakistan, and he had three sons Kand, Zamand, Kasi, whereas his brother Sharkhbun's progeny compose the Western Pashtuns, generally found in Afghanistan, the most famous of these latter Pashtuns being the Durrani or Abdali tribes. The following is a genealogical breakdown of Kharshbun's sons and the tribes that are said to be their descendants, as found in Olaf Caroe's history, "The Pathans".
Document 4: Raja Khishtasub Khan: Raja Khishtasub Khan was the most powerful ruler of Baghpurdheri and State of Khanpur. He was the son of sultan Raja Shair Ahmad khan,and he was the father of Sultan Raja Aziz Ahmad and grand father of Raja Pervaiz Ahmad.At his time he was most powerful then sultan Raja Jahandad khan.
Document 5: Arachosia: Arachosia is the Hellenized name of an ancient satrapy in the eastern part of the Achaemenid, Seleucid, Parthian, Greco-Bactrian, and Indo-Scythian empires. Arachosia was centred on the Arghandab valley in modern-day southern Afghanistan, although its influence extended east to as far as the Indus River in modern-day Pakistan. The main river of Arachosia was called "Arachōtós", now known as the Arghandab River, a tributary of the Helmand River. The Greek term "Arachosia" corresponds to the Aryan land of "Harauti" which was around modern-day Helmand. The Arachosian capital or metropolis was called Alexandria Arachosia or Alexandropolis and lay in what is today Kandahar in Afghanistan. Arachosia was a part of the region of ancient Ariana.
Document 6: Old Kandahar: Old Kandahar (locally known as Zorr Shaar; Pashto: زوړ ښار‎ , meaning "Old City") is a historical section of the city of Kandahar in southern Afghanistan. It is thought its foundation was laid out by Alexander the Great in 330 BC under the name Alexandria Arachosia. and served as the local seat of power for many rulers in the last 2,000 years. It became part of many empires, including the Mauryans (322 BC–185 BC), Indo-Scythians (200 BC–400 AD), Sassanids, Arabs, Zunbils, Saffarids, Ghaznavids, Ghorids, Timurids, Mughals, Safavids, Hotakis and others. It was one of the main cities of Arachosia, a historical region sitting between Greater Iran and the Indus Valley Civilization. The city has been a frequent target for conquest because of its strategic location in Southern Asia, controlling the main trade route linking the Indian subcontinent with the Middle East, Central Asia and the Persian Gulf.
Document 7: Kandahar: Kandahar ( ) or Qandahar (Pashto: کندهار‎ "Kandahār" ; Dari: قندهار‎ ‎ "Qandahār" , known in older literature as Candahar) is the second-largest city in Afghanistan, with a population of about 491,500 as of 2012 . Formerly called Alexandria Arachosia, the city is named after Alexander the Great, who founded it in 329 BC around a small ancient Arachosian town. Kandahar is the capital of Kandahar Province, located in the south of the country at an altitude of 1,010 m above sea level. The Arghandab River runs along the west of the city. The city of Kandahar has a population of 557,118. It has 15 districts and a total land area of 27,337 hectares. The total number of dwellings in Kandahar is 61,902.
Document 8: Suhaldev: Suhaldev is a semi-legendary Indian king from Shravasti, who is said to have defeated and killed the Ghaznavid general Ghazi Saiyyad Salar Masud in the early 11th century. He is mentioned in "Mirat-i-Masudi", a 17th-century Persian-language historical romance. Since the 20th century, various Hindu nationalist groups have characterized him as a Hindu king who defeated a Muslim invader.
Document 9: Arghandab River: Arghandab is a river in Afghanistan, about 400 km in length. It rises in the Hazarajat country north-west of Ghazni, and flows south-west falls into the Helmand 30 km below Girishk. In its lower course it is much used for irrigation, under the control of the Helmand and Arghandab Valley Authority, and the valley is cultivated and populous; yet the water is said to be somewhat brackish. It is doubtful whether the ancient Arachotus is to be identified with the Arghandab or with its chief confluent the Tarnak, which joins it on the left 50 km southwest of Kandahar. The Tarnak, which flows south of Kandahar, is much shorter (length about 320 km or 200 miles) and less copious.
Document 10: Geography of Afghanistan: Afghanistan is a landlocked mountainous country located within South Asia and Central Asia. The country is the 40th largest in the world in size. Kabul is the capital and largest city of Afghanistan, located in the Kabul Province. Strategically located at the crossroads of major trade routes, Afghanistan has attracted a succession of invaders since the sixth century BCE.
Document 11: Peshawar: Peshawar (Pashto: پېښور‎ ;    ; Urdu: ‎ ;    ; Hindko: پشور ) is the capital of the Pakistani province of Khyber Pakhtunkhwa. It also serves as the administrative centre and economic hub for the Federally Administered Tribal Areas. Situated in a broad valley near the eastern end of the historic Khyber Pass, close to the border with Afghanistan, Peshawar's recorded history dates back to at least 539 BCE, making it the oldest city in Pakistan and one of the oldest in South Asia. With a population of 1,970,042 according to the 2017 census, Peshawar is the largest city in Khyber Pakhtunkhwa and the sixth-largest in Pakistan.
Document 12: Hindu and Buddhist heritage of Afghanistan: Before the Islamic conquest of Afghanistan communities of various religious and ethnic background lived in the land. South of the Hindu Kush was ruled by the Zunbil and Kabul Shahi rulers. When the Chinese travellers (Faxian, Song Yun, Xuanzang, Wang-hiuon-tso, Huan-Tchao, and Wou-Kong) visited Afghanistan between 399 and 751 AD, they mentioned that Buddhism was practiced in different areas between the Amu Darya (Oxus River) in the north and the Indus River in the south. The land was ruled by the Kushans followed by the Hephthalites during these visits. It is reported that the Hephthalites were fervent followers of medieval Hinduism, and that they worshipped Hindu aspects of God, known as Shiva and Vishnu, as well as Surya.
Document 13: Helmand Province: Helmand ( ; Pashto/Dari: هلمند), also known as Hillmand, and, in ancient times, as Hermand and Hethumand is one of the 34 provinces of Afghanistan, in the south of the country. It is the largest province by area, covering 58,584 km2 area. The province contains 13 districts, encompassing over 1,000 villages, and roughly 879,500 settled people. Lashkar Gah serves as the provincial capital.
Document 14: King Romapada: Romapada or Chitraratha was the youngest son King Vidarbha of Yadava and an adopted son of King Dharmaratha of Anga. King Vidarbha had many sons but his friend King Dharmaratha had no son and so King Dharmaratha adopted his friend King Vidarbha's youngest son Romapada. When King Vidarbha became old made Vidarbha Kingdom and made Kratha as the next Yadava ruler and made his second son Bhima as the ruler of Vidarbha and went to forest. King Dharmarata named his adopted son as Chitraratha and also that people called him Romapada. When King Dharmaratha grew old , He decided to make Romapada as the ruler of Anga.
Document 15: Śuddhodana: Śuddhodana (Sanskrit: शुद्धोधन ; Pali: "Suddhōdana"; Sinhalese: සුද්ධෝදන මහ රජතුමා ), meaning "he who grows pure rice," was a leader of the Shakya, who lived in an oligarchic republic with their capital at Kapilavastu. He was also the father of Siddhartha, who later became known as Gautama Buddha.
ground_truth: Vasudeva of Kabul