A keyword search for monuments roman, leads me to Death and the Emperor: Roman Imperial Funerary Monuments, from Augustus to Marcus Aurelius.
Here are some Subject headings assigned. In UC Library Search, these are hyperlinked and can be used in future searches.
Subject headings start with the topic and may have subheadings -- indicated with a dash -- that can refer to topical (antiquities), publication (dictionary), time period (19th century), or geographic area (Rome). Subheadings make the subject more specific.
Subject headings may be inverted to emphasize the most important word. See examples with commas.