Question: the main achievement of the 287 b.c. law in roman constitutional history was

title: History of the Constitution of the Roman Republic
text: By 287 BC , the economic condition of the average Plebeian had become poor , and the result was the final Plebeian secession . The Plebeians seceded to the Janiculum hill , and to end the secession , a Dictator named Quintus Hortensius was appointed . Hortensius , a Plebeian , passed a law called the `` Hortensian Law '' ( Lex Hortensia ) , which ended the requirement that an auctoritas patrum be passed before any bill could be considered by either the Plebeian Council or the Tribal Assembly . The requirement was not changed for the Centuriate Assembly . The importance of the Hortensian Law was in that it removed from the senate its final check over the Plebeian Council ( the principal popular assembly ) . It should therefore not be viewed as the final triumph of democracy over aristocracy , since , through the Tribunes , the senate could still control the Plebeian Council . Thus , the ultimate significance of this law was in the fact that it robbed the Patricians of their final weapon over the Plebeians . The result was that the ultimate control over the state fell , not onto the shoulders of democracy , but onto the shoulders of the new Patricio - Plebeian aristocracy . 

Answer: answer: Hortensius, a Plebeian, passed a law called the ``Hortensian Law'' which ended the requirement that an auctoritas patrum be passed before any bill could be considered by either the Plebeian Council or the Tribal Assembly.  The result was that the ultimate control over the state fell, not onto the shoulders of democracy, but onto the shoulders of the new Patricio - Plebeian aristocracy.