Reginald de Grey was responsible for giving out royal demands in the Northern March. This included calling the local nobility and gentry and their men to Royal and military service. He was had been in a long-running legal argument with Glyndŵr, claiming part of Glyndwr's land as his own. Under King Richard II the case had been found in favour of Glyndŵr. When Henry IV became king, Grey took over the land. 