tresayle

noun

1. (obsolete)A grandfather's grandfather; a great-great-grandfather.

   “If any one wishes to speak of a great-great-grandfather (tresayle) through some side line, as his grandmother’s mother’s father, he has to use an explanatory mode like the above.”

   “Thomas Boston Clarkson, whose genealogy is given in the third pamphlet, was born in Charleston, S. C., Sept. 4, 1809. His maternal grandmother was Christiana, daughter of Thomas Boston, V.D.M., whose ancestry is traced back five generations to her tresayle, Andrew Boston, born in Ayre, Scotland, about 1597.”

   “[…]in 1834, he prefixes to his diary a record of his ancestors, running back four generations to his tresayle, or great-great-grandfather, Joseph Towne, living in Topsfield, 1684.”

   “In April 1600 Delahay protested to Sir Robert that on a Sunday in March 'I was assaulted and violently pulled […] , and where men see Richard Cecil your tresayle [actually his great-grand brother] use'-by the procurement of John Arnold.”