The XV legion was stationed at Carnuntum, a Roman Limes, or frontier fort on the Danube and the gravestone is likely to date from between 90-138AD.
Carnuntum (Καρνους in Ptolemy) was a Roman army camp on the Danube in the Noricum province and after the 1st century the capital of the Upper Pannonia province.
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Its name first occurs in history during the reign of Augustus (6 AD), when Tiberius made it his base of operations in the campaigns against Maroboduus (Marbod).
In terms of forts, one theory has the regiment stationed in Poetovio (Ptuj, Slovenia) in the Flavian period (69-96) and then moving to Carnuntum with Legio XIV Gemina.
Several authors, like Marcus Aurelius' biographer Frank McLynn, accepting the date of defeat near Carnuntum as 170, place the great Germanic invasion itself three years earlier.