India, July 20 -- Prince Al-Waleed bin Khaled Al-Saud, a Saudi royal widely known as the "Sleeping Prince" after spending 20 years in a coma following a devastating car crash in London, has died at the age of 36.

Al-Waleed, the eldest son of Prince Khaled bin Talal Al Saud, was just 15 when he was involved in a high-speed accident in 2005 while studying at a military college in the United Kingdom.

The crash caused a brain haemorrhage and internal bleeding, leaving him in a deep coma from which he never recovered.

He was later moved to King Abdulaziz Medical City in Riyadh, where he remained on a ventilator for two decades. Despite the prognosis, Prince Khaled consistently refused to withdraw life support and remained hopeful that his s...