LACUS FELICIS a place in Noricum, on the south of the Danube, 25 miles west of Arelape, and 20 miles east of Laureacum ( It. Ant. pp. 246, 248). According to the Not. Imper., where it is called Lacufelicis, it was the head-quarters of Norican horse archers. It is now generally identified with the town of Niederwallsee, on the Danube.
[L.S]