Lord John Mackenzie XI, Steadholder Mackenzie, was a Grayson citizen and steadholder.
He was the last steadholder to invite a Protector, Bernard Mayhew VII, to his steading before Benjamin IX was invited to Harrington Steading. When John Mackenzie XI invited Bernard VII and his wives over for a suprise birthday party on June 10, 3807 CE, the experience made a profound impession on Bernard VII, for he recorded the actual menu, including the ice cream flavors, in his personal diary.(HH8)