Letters to Pliny the Younger reveal the ambitions of this optimus princeps who conquered Dacia and Parthia.  
His legate Corelius Palma annexed the Nabataean kingdom in preparation for his campaign to reinstate the king of Armenia, during which he took Bostra and named it for himself.  He took only half the money given upon accession of new emperors and established the alimenta funds for poor children.  He captured Sarmizegethusa, which led to the suicide of Decebalus, and made his cousin his successor because he had no children with his wife Plotina.  Letters to Pliny the Younger reveal the ambitions of this optimus princeps who conquered Dacia and Parthia.  FTP name this emperor who was succeeded by Hadrian, best known for commissioning his namesake column.
His legate Corelius Palma annexed the Nabataean kingdom in preparation for his campaign to reinstate the king of Armenia, during which he took Bostra and named it for himself.  
Marcus Ulpius Trajanus (or Caesar Filius Nerva Trajanus Optimus Augustus)