A ruler of this historical state supposedly once traded livestock in Constantinople, inspiring his epithet “the Shepherd.” A perceived slight led a ruler of this state to nail the turbans of a group of ambassadors to their heads. (10[3]-5[2])A ruler of this state carefully noted in his journal (10[1])that his forces (10[2])had killed (-5[1])23,844 (10[1])enemies, (-5[1])excluding those burned and beheaded. This state won independence after its founder ambushed the forces of Charles Robert at Posada. A ruler of this state built the mountaintop Poenari (“po-ay-NAR-ee”) Castle (10[1])before it was besieged by his brother, who was called “the Fair” or (10[1])“the Handsome.” A leader of this state, (10[1])which was ruled by the Basarab (10[1])dynasty, attempted to assassinate the invading sultan Mehmed II (10[1])in the Night Attack at Târgoviște (10[1]-5[1])(“tir-GO-veesh-teh”). In the 19th century, this state joined with Moldavia to form the (10[1])United Principalities. (10[1])For 10 points, name this state that was ruled under Ottoman suzerainty by Vlad the Impaler. ■END■ (10[5])