Simeon I was content with the results and considered that he had superiority over the Byzantine Empire. Despite the success, he realized that there was still a lot to do before prevailing over the Empire for good. He needed his own political and ideological base, and he consequently launched an ambitious construction program in Preslav so that it could rival Constantinople. In the meanwhile, Simeon I had also imposed his authority over Serbia in return for recognizing Petar Gojniković as its ruler. That was an important move towards reducing Byzantine influence over the Western Balkans.