Baronetcies of Scotland Created with a Special Remainder is in Scotland Lords Temporal.
In 1627 Walter Aston 1st Baronet [aged 43] was created 1st Baronet Aston of Forfar. The title appears to have been created with a special remainder to heirs male of Edward Aston and his brother William Aston of Milwich [aged 72] since when the 5th Baronet died a descendant of William Aston of Milwich succeeded.