These symbols ( representing the three Transylvanian estates ) had been in use ( usually with the Hungarian coat of arms ) since the 16th century .
Transylvanian princes maintained Transylvanian 's claims to the throne of Hungarian     Hungary .
These symbols ( representing the three Transylvanian estates ) had been in use ( usually with the Hungarian coat of arms ) since the 16th century because Transylvanian princes maintained their claims to the throne of the Kingdom of Hungary .