The region had a distinct jurisdiction under a Voivode of Transylvania from the 12th century. Whether it used a heraldic symbol at this stage is a matter of dispute among modern heraldists. Dan Cernovodeanu dismisses the notion, arguing that there was a general uninterest in regional heraldry, manifested throughout high-medieval Hungary; similarly, Károly Kisteleki argues that: "Transylvania did not have an independent coat of arms in the pre-1526 medieval Hungarian Kingdom." The "Book of Knowledge of All Kingdoms" claims a "green flag with a red scimitar" as standing for the "Kingdom of Siluana" or "Septem Castra". The latter is a reference to Transylvania as the country of "seven cities". According to historian Iulian Marțian, this name may predate Hungarian conquest, and is traceable to Roman Dacia. He argues that seven towers may have already been a Transylvanian symbol at that stage, noting that the "Dacian" metropolis of Sirmium was represented by a tower on a field of "gules".