Opus latericium (also called opus testaceum) was a construction technique using bricks. It was first used in the first century BCE, and it was the dominant construction technique throughout the imperial period. Many of the large imperial structures, such as the imperial baths of Rome, were built in opus latericium.
Structures in opus latericium are often easily datable, because they are stamped by the producer. These brick stamps were common from the first century BCE until 164 CE. At this time all the brick producing plants had passed into imperial hands and the brick stamps disappeared, to reappear only in the reign of Diocletian in the late 3.
Cement was Opus Caementicium