 Complete the following phrase:  The Treaty of Dara, also known as the Fifty-Year Peace, was a peace treaty concluded between the Byzantine Eastern Roman and Sassanid Persian empires at the frontier town of Dara in what is now southern Turkey in 562. The treaty, negotiated by Peter the Patrician for the Byzantine emperor Justinian I and Izadgushasp for the Sassanid king Khosrau I ended the 20-year-long 