sentences:  The third baronet was a naturalised American.The Menteths descend from ancient Earls or Mormaers of Menteith, and more specifically from the marriage in 1260 of Mary, Countess of Menteth with Walter Bailloch Stewart, son of Walter Stewart, 3rd High Steward of Scotland.The Stuart name was not adopted until 1770, when the first baronet's father, Rev.