|Comune di Martinsicuro|
|• Mayor||Massimo Vagnoni|
|• Total||14.66 km2 (5.66 sq mi)|
|Elevation||2 m (7 ft)|
|Population (30 September 2017)|
|• Density||1,100/km2 (2,800/sq mi)|
|Time zone||CET (UTC+1)|
|• Summer (DST)||CEST (UTC+2)|
|Patron saint||St. Gabriel|
|Saint day||27 February|
Remains of a Bronze Age (10th-9th centuries BC) settlement were found in the communal territory, on a hill overlooking the Tronto river. At the river's mouth existed Truentum, remembered by Roman writer Pliny the Elder as part of the Roman region of Picenum, and attributed to the Liburni tribe. It was noted during the Roman civil wars as one of the centers occupied by Julius Cesar Cic. to Att.. It is cited by Strabone, Mela and Sillo Italico, also reported in the "Antonini Itinerary" and in the "Peutingeriana Tabula". The territories alongside of his river were divided under the reform of emperor August. After the Roman conquest in the 3rd century BC it became a municipium and later was reached by the Via Salaria.
Castrum Truentinum was conquered by the Lombards in the wake of the fall of Fermo in 580, but in the subsequent centuries most of the inhabitants moved to other centres in the mainland. In the 16th century the Spaniards built here two watchtowers, around which a small borough grew.
- Tower of Charles V (1547). Since 2009 it has housed an archaeological museum.
Martinsicuro is twinned with: