Other contributors have said "Colonists who remained loyal to the king of england tory?" is the same question as "What were the colonists who remained loyal to the king of England during the American revolution called?". If you believe that these are not asking the same thing and should be answered differently, click here.
An American colonist who remained loyal to King George III was known as a Loyalist or a Tory (plural "Tories").
"Tory" is also a name applied to Conservative political parties in the UK and Canada.