Tipasa was a trading post concqured by the Romans and turned into a military colong by Emperor Claudius.
From Schoder's lecture notes:
Phoencican commercial base, Latin colony 1 c., Roman colony 2 c., walls mile and half circuit. One of chief centers of Christianity inMauretania; famed Marts
Typcial African coastline nearby
Theater: rear access -- rare type not on hill, valley
"Tombeau de la Chretienne": n. Tipasa on high hill. II/I c. royal tomb of Mauretanian kings. Pompoinus Mela calls it monumentum commune regiae gentis. 205 ft. diam., 130 ft. high. Circular base w. 60 engaged Ionic cols. At four points of compass, false doors with cross-like dec. (explaining false name). Inside 3 concentric corridors, central vault, niches for funeral urns.