One of three regalia weapons of Archanea, Gradivus serves as the counterpart to the sword Mercurius and the bow Parthia. Taking its roots from obscure origin, this lance was stolen Adrah, where it played a crucial role in his conquering the continent of Archanea. Upon founding the Kingdom of Archanea, Gradivus was dubbed a Regalia and subsequently passed down through succeeding generations of Archanean royalty.
During the War of Darkness, the Gradivus is originally wielded by the Grustian general Camus as his weapon of choice. Although brimming with confidence in Gradivus' ability to lead him to victory in Chapter 20, Camus is eventually defeated, and possession of the lance is eventually ceded over to Marth's army.
During the ensuing War of Heroes, the newly-coronated Emperor Hardin inherits the Gradivus and wields it as his weapon of choice until his death in Chapter 20, where it again is passed to Marth's army.
Mars Gradivus is one of many titles accorded to the Roman god of war, Mars. Temples constructed in his honour were once the converging points where Roman troops gathered to rally during the moments preceding any imminent battle.