The second ruler of this name failed to marry his niece Zoe off to Otto III and obtained his moniker by defeating Tsar Samuel's forces at Ochrida.
One ruler with this name was a Moldavian prince dubbed "the Wolf," who introduced the first written laws to Moldavia. A ruler with this name murdered Caesar Bardas. Another bearer of this name gave his sister Anne in marriage to a neighboring prince in exchange for conversion to Christianity. In addition to naming the brother-in-law of (*) Vladimir I of Kiev, this name belongs to a ruler who overthrew Michael III and had Ignatius installed over Photius as patriarch of Constantinople. The second ruler of this name failed to marry his niece Zoe off to Otto III and obtained his moniker by defeating Tsar Samuel's forces at Ochrida. For 10 points, identify this name shared by the founder of the Macedonian dynasty as well as a later member who styled himself "the Bulgar-slayer."
One ruler with this name was a Moldavian prince dubbed "the Wolf," who introduced the first written laws to Moldavia.
Basil [accept Vasily because of the first clue]