Forbhlaith (written also as Forflissa, Ferelith, Fernelith or Forueleth) was the latter of two heiresses of Atholl, the other being her sister Isabella. She married David de Hastings, a French knight who already possessed minor lands in Angus. They were, however, without a son when David died in 1247. They were succeeded by their daughter Ada.
- Lundy, Darryl (30 October 2004), Ada Hastings, Countess of Atholl, The Peerage
- G. E. Cokayne; et al. (2000), The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, I (new, 13 volumes in 14 (1910-1959; reprint in 6 volumes ed.), Gloucester, UK: Alan Sutton Publishing, p. 305
- Roberts, John L. (1997), Lost Kingdoms: Celtic Scotland in the Middle Ages, Edinburgh, pp. 54–5[full citation needed]
- Sellar, David, "Forflissa/Forbflaith/Hvarflöð", Regions and Rulers in Ireland c.1100-c.1650, pp. 51–53[full citation needed]
- Forbhlaith (Scottish Gaelic Given Names for Women)
| Mormaer of Atholl
m. John de Strathbogie