If there are still muslims on Siciliy you may want to consider attacking them at this date. Then head south and capture Apulia province.
You should be able to grab parts of Croatia and entire Wallachia (just ignore the penalty since they are pagans so anyway it doesnt matter much if they dislike you). Ignore the Muslims because now they are most likely busy fighting among themselves at this date. Imperial Reconquest can be used on the following kingdoms(not counting Muslims, you use Holy War on them): You will also need lots of prestige in order to create the Roman Empire. In order to make this title you need to capture several duchies in Italy including Latium, Ferrara, Genoa and Venezia, the Balkans, Asia Minor, Syria (Antioch), Coast of Egypt (Alexandria) and North Africa (Tunisia).
The Byzantine Empire and the Holy Roman Empire (if Byzantine conquered) are the only empires that can create this title. The Roman Empire is part of the Legacy of Rome DLC.
