Acumincum was an ancient Roman settlement in what is now the town of Stari Slankamen in Serbia.
In the 3rd century B.C. BC the area was inhabited by Celtic Scordisci. In the 1st century B.C. The fortress was conquered by the Romans and the settlement was known as Acumincum (sharpness).
Located in the Roman province of Pannonia as a fort on the Pannonian Limes, it was noted by the ancient geographer Ptolemy and the geographer of Ravenna. The name also appears as Acimincum and in Peutinger's table the name Acunum is written.
A Flavian fort was strategically placed to patrol the land across the Tisza, the legion Camp Cohors I Britannica equitata and II Adjutrix were stationed in the city. Jupiter Dolichenus sculptures have been found in the city. Roman fortifications have been excavated at the site of Dugorep.
Slavs settled in this area in the 6th century. Old Slavic tombs from the 6th and 7th centuries have been found in Slankamen. In the Middle Ages, Slankamen was a fortified town and was first mentioned in 1072 as Castrum Zalankemen. Arsenije I Bogdanović of Srem, the second Serbian Archbishop (1233–1263) after Saint Sava, was born in the village of Dabar near Slankamen.
In 1325, according to a letter from Pope John XXII. built a public hospital in the village to the Roman Catholic Archbishop of Kalocsa. In the 15th century the town was owned by Serbian despots Stefan Lazarević and Đurađ Branković. From 1451 it was owned by Hunyadis and from 1498 by John Corvin. In the 16th century it was a residence of Radoslav Čelnik, a duke of Srem.
Source: Wikipedia (English)
Slavs settled in this area in the 6th century. Old Slavic tombs from the 6th and 7th centuries have been found in Slankamen.