Fergus Goll, Ancestor of the Gowrie Men

Broun’s solution was that after the unchronicled death or expulsion of Conall son of Aedán in 811 Constantín reasserted Verturian hegemony over Dál Riata and placed his own son in as sub-regulus or tributary king. The gap between the death of Donncoirce and the start of Conall son of Tadg’s reign may have been the result of a scribal error, Conall’s reign length being mis-copied, but since it coincides in part with the attack of the Hördar on Dál Riata and their possible use of the region as a base for further attacks on Ireland, it may coincide with the period of their occupation. Indeed, the appearance of the Northmen along the west coast of Ireland in 807 may have been as a result of the abandonment of their occupation of Dál Riata. Thus, we may now produce a king-list for Dál Riata which looks something like this:

Fergus son of Eochaid 778-81
Donncoirce 781-92
Hördar occupation c. 793-806
Conall son of Tadg 805-7
Conall son of Aedán 807-11
Domnall son of Constantín 811-35
Aed son of Boanta 835-9

• Woolf, A : From Pictand to Alba, 2007, Edinburgh University Press p64

Searching for Broun's paper 'Imagining Alba' that is cited as verifying above.

Possibly amongst these:

The translation is apparently here
Unlikely to be found online, in my opinion.

No, here it is:
https://archive.org/details/cu31924028144313/page/n121/mode/2up?q=f...

Early sources of Scottish history, A.D. 500 to 1286; by Anderson, Alan Orr, 1879-1958, ed. 1922
Publisher Edinburgh, London, Oliver and Boyd
Collection cornell; americana
Contributor Cornell University Library