The Lorien Trust was originally formed as a non-profit organisation in 1991 by a group of live action role-players in the UK. They wanted to create their own system due to dissatisfaction with the Fools and Heroes LARP. As time passed, the organisation formed into a company, the Lorien Trust (limited by Guarantee). This was run as a trust by a board of trustees.
In 1995 this was replaced by a new company called Merlinroute Ltd which currently trades as the Lorien Trust. Merlinroute Ltd continue to run the Lorien Trust Role-Playing system and its four large weekend events per year, as well as charging other groups to run events within its game world on other weekends.