You must first complete the <a href="https://www.legendhub.org/quests/details.html?id=147">elite guardsman quest</a>. Go to the Ottoman envoy's quarters -- he will give a tabard to you. Go to the janissaries at the southern border -- GIVE TABARD JANISSARY. You are taken to the throne room where Vlad is killed. You receive EXP!
credit: <a href="http://www.legenddb.com">legenddb</a>