A British court heard on Wednesday charged a man who entered Queen Elizabeth's Windsor Castle home on Christmas Day last year wearing a mask and holding a crossbow with the intention to kill the Queen. 

Jaswant Singh Chail, 20, has been charged under Britain's Treason Act after having spent months plotting the attack and trying to gain access to the royal family, according to what was relayed to London's Westminster Magistrates' Court. 

Chail recorded a video before his intrusion into the castle to the west of London where the queen monarch mostly resides, and was there that day as well. 

"I am sorry for what I have done and what I will do. I am going to attempt to assassinate Elizabeth, queen of the royal family," he said in his video, holding a crossbow and wearing a face covering.

Revenge for a 103-year-old massacre

Chail claimed the attack to be revenge for those who were killed in the 1919 massacre, known as the Jallianwala Bagh massacre when British troops murdered nearly 400 Sikhs in their holy city of Amritsar in northwestern India. 

He trespassed the property around 8.10 AM and after being spotted by a protection officer, the officer drew his taser and shouted at the assailant to get on his knees and drop the crossbow to which Chail complied.

Chail has been charged with making threats to kill, possessing an offensive weapon, and committing an offense under section 2 of the Treason Act 1842.

The case will be heard next at London's Old Bailey on a date to be announced.