Some contemporary cases are included in the selection of papers compiled by Richard Noll. WEREWOLVES AND VAMPIRES: Werewolves and vampires have been reported as existing side by side in the mythologies of many cultures, but they have a special relationship in the southern Balkan area, from whence much of the modern vampire myth comes. That relationship was particularly evident in the use of the term vrykolakas (and cognate terms in various Slavic languages) to describe vampires in recent centuries in Greece.

In accounts of the vrykolakas in southern Balkan countries, there was some confusion over the word's meaning. In the early twentieth century, pioneer researcher Freidrich Krauss, working in Bosnia, concluded that the vrykolakas (spelled vukodlak in Bosnia) was a werewolf (i.e., a man or woman who changed into a wolf and attacked the local cattle). More recent researchers such as Harry Senn and Jan L. Perkowski have argued that the word vrykolakas derived from an old Slavic word that referred to the ritual wearing of wolf pelts among Slavic tribes during the first millennium AD. Earlier Mircea Eliade had observed that the Dacians, the people who previously resided in what is present-day Romania and whose name means wolf, ritually transformed their young warriors into wolves by dressing them in wolf pelts and engaging in appropriate mimicking behavior.

The historian Herodotus had described such behavior among the early people of the southern Balkans. At the time the wolf was admired as a warrior animal. Senn noted that during the early centuries of the second millennium the perceived role of the wolf changed from one that was admired to one that was feared. The wolf became a threat to the community because it attacked livestock and people. Over the first centuries of the second millennium AD, the use of the term vrykolakas lost its ritual meaning (as the image of the wolf changed and the ritual itself disappeared).

According to Senn, the reference point of vrykolakas was transferred to the vampire; throughout the southern Balkans (Romania, Serbia, Croatia, Greece, etc.), it replaced older terms for the vampire. Perkowski emphasized that there was an intermediate step in which the term took on a mythological reference to a being who chased the clouds and devoured the moon (Agnes Murgoci, working in Romania in the mid-1920s, found continued references to this meaning of vrykolakas).

Further transition was made in the sixteenth century, by which time vrykolakas had began to refer to vampires. That meaning then spread throughout the southern Balkans and into Greece. Perkowski has even argued that the terms never referred to a werewolf, as Krauss and others have suggested. Among modern Romanians there is a were-creature, the tricolici (or pricolici), a man who may take the from of a pig, a dog, or, less often, a wolf. Belief in werewolves apparently peaked in Europe during the late Middle Ages. While many refused to believe that actual werewolves existed, many believed that lycanthropy was caused by the devil.