Question: Who was the son of the ruling king of the second largest city in Afghanistan
Related documents: [0]  [DOC] Vasudeva IV was reportedly a Kushan King ruling in Kandahar. He was the possible father of Vasudeva of Kabul. [END] 
[1]  [DOC] 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. [END] 
Answer: 
Vasudeva of Kabul
Vasudeva of Kabul