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This is a nice Roman silver Siliqua of emperor Magnus Maximus dating to 383 - 388 A.D.
DN MAG MA-XIMVS PF AVG pearl-diademed, draped and cuirassed bust right
VIRTVS RO-MANORVM Roma seated facing on throne, head left, holding globe and spear
This coin was minted at Aquileia (Italy), mintmark AQPS. The coin has some mirror surfaces and horn-silver in places, this is usually indicative of being buried within a hoard or pot. It is a rarer mint for this issue.
DATE: 383 - 388 A.D.
MINTMARK: AQPS (Aquileia)
SIZE: 16mm diameter
WEIGHT: 1.33 grams
ATTRIBUTION: RIC IX Aquileia 54a; RSC 20d; Sear 20646.