Two entries with the name of Albanact.
Albanact
Albanactus, Alben
Son of King Brutus (first king of Britain), and thus a great-great-grandson of the Trojan Aeneas, brother of Camber and Locrine (Locrinus), and father of Embrunt, Dombart, and Arbrun.
Albanact gave his name to Albany (Scotland). His kingdom was invaded by Huns, and Albanact was killed.
Sources
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Palamedes | c. 1240
Albanact
The captain of Arthur’s guard in Dryden’s opera King Arthur.
His name was presumably taken from Albanact, son of Brutus in Geoffrey of Monmouth’s Historia Regum Brittaniae.
Source
King Arthur; or the British Worthy | John Dryden, 1691