After reading here that an ancestor of Samuel Tyack (born in Truro) was Sir Rawlings Tyack, another Tyack, "Rawlings Tyack of Truro", who lived about 1835, is said (by my sister-in-law, who is also a Tyack) to have made his genealogy and deposited it at the "Heralds Office" in London. The arms of his family seemed to be : "Or, a feas between three wild boars' heads of Sable". His ancestor was also an Rawlings Tyack who had many children. These two ancestors whose name is Rawlings could probably be only one : Rawlyn Tyack who was buried on the 8th of March 1580-1 at St. Breock (Cornwall) and who was married with Jane Penrose and had eight children. This Rawlyn appears in the pedigree of the Tyacks (or Tyackes) said "of St. Breock", and also later "of Plymouth" and "of Saltash", which is available by Internet in "The Visitations of Cornwall" of Vivian, pp. 523 and 524. It was written elsewhere that "Tyacke is the name of a cornish family of considerable antiquity. Their name is to be found amongst the gentry in 1573". This is exactly the year of the first part of this pedigree, recopied by Vivian, in which Rawlyn Tyack is already mentionned and still living. All these informations concern probably the same man : Sir Rawlyn Tyack, knight (the title of baronet did not yet exist). But all the Tyacks certainly descend not from him.