
1) Historical Celtic people 2) Tribe of ancient Britain
Found on
https://www.crosswordclues.com/clue/attacotti

The Attacotti (Atticoti, Attacoti, Atecotti, Atticotti, Atecutti, etc. variously spelled) were a people who despoiled Roman Britain between 364 and 368, along with Scotti, Picts, Saxons, Roman military deserters, and the indigenous Britons themselves. The marauders were defeated by Count Theodosius in 368. Units of Attacotti are recorded about 400...
Found on
http://en.wikipedia.org/wiki/Attacotti
No exact match found.