John O' Groat's House, on the Caithness coast, 1¾ m. W. of Duncansby Head, marks the northern limit of the Scottish mainland; the house was said to be erected, eight-sided, with a door at each side and an octagonal table within, to compromise the question of precedence among eight branches of the descendants of a certain Dutchman, John o' Groot.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
John of Gaunt * John of Leyden