Gromatici (from Latin groma or gruma, a surveyor's pole), or agrimensores, was the name for land-surveyors amongst the ancient Romans.
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Somewhat later than Trajan was Siculus Flaccus (De condicionibus agrorum, extant), while the most curious treatise on the subject, written in barbarous Latin and entitled Casae litterarum (long a school textbook) is the work of a certain Innocentius (4th-5th century).