Five years passed. King Milutin was growing old. Hearing good reports about his son, his heart softened, and he called Stephen home to Serbia. Before leaving Constantinople, Stephen had a dream in which St. Nicholas appeared to him a second time, holding in his hand a pair of eyes. When he awoke, his sight was restored.
Three years later, his father died, and Stephen, always popular with the people, was crowned King of Serbia by the holy Archbishop Nikodim in the church at Pec. His half-brother, Constantine, resented this turn of events, and raised an army in order to wrest the throne away from Stephen. Desiring to avoid bloodshed, King Stephen addressed a letter to Constantine:
"Put far from thee thy desire to come with a foreign people to make war on thine own countrymen; but let us meet one another, and thou shalt be second in my kingdom, for the land is great enough for me and thee to live. I am not Cain who slew his brother, but Joseph who loved him, and in his words I speak to thee. Fear not, for I am from the Lord. You prepared evil for me, but the Lord has given me good, as you now see."
Constantine was unmoved and gave orders to attack. In the ensuing battle, his army was defeated and he himself was slain.
(taken from: http://www.roca.org/OA/128/128e.htm)