From what I found on the web:

http://www.angelfire.com/country/veneti/Distortions.html

In this article it is said:

In his article Dr. Stih states that King Samo was of Frankish origin. This is as untrue as it is prejudicial to Slovenians who were the most important part of his kingdom. In Veneti (page 144) we read: "King Samo (623 - 658) was originally a merchant in the Frankish province of Senonago, the location of which is no longer known. The document, Fredegarii Chronicon (around 658), includes Samo among Frankish nationals (natione Francus), which does not mean that he was also of Frankish extraction (genere Francus). At his court Slavic customs were the rule and the envoy had to change into Slavic attire before he could be presented to King Samo. Would the Slavs have chosen a man of Frankish origin to be their king? The later document Conversio Bagoariourum et Carantanorum (circa 873) clearly shows that Samo reigned in Carantania. The Excerptum of this document presents him as the first Duke of the Carantanians."

"Samo's residence could only have been in Carantania, south of the Danube, which St. Amand had to cross in order to reach his court. Missionaries were required first to present themselves before the king in order to receive consent for their mission."

However, according to Dr. Stih, there were no Slovenians in Carantania. He says they were Carantanians: "In other words, we made Slovenians out of Carantanians, which they certainly were not." This sort of interpretation of conditions at the time is the norm among historians like Dr. Stih. The Department of History in Ljubljana still relies entirely on foreign theories and interpretations of Slovenian history. Indeed, its principal function appears to be the enforcement of foreign theories.

We must also note that Slovenians never had their own History School; they were never allowed to carry out independent research, whether under the Austrian Hapsburgs or Serb-dominated Yugoslavia, and nothing has changed even in independent Slovenia. Slovenian historians continue copying, mainly from Austrian history books, and Dr. Stih is part of this scenario.