Dečanski's decision not to attack the Byzantines after the victory at Velbazhd, when he had an opportunity, resulted in the alienation of many nobles, who sought to expand to the south. By January or February 1331, Dušan was quarreling with his father, perhaps pressured by the nobility. According to contemporary pro-Dušan sources, advisors turned Dečanski against his son, and he decided to seize and exclude Dušan from his inheritance. Dečanski sent an army into Zeta against his son; the army ravaged Skadar (modern Shkodër), but Dušan had crossed the Bojana river. A brief period of anarchy took place in parts of Serbia before father and son concluded peace in April 1331. Three months later, Dečanski ordered Dušan to meet him. Dušan feared for his life and his advisors persuaded him to resist, so Dušan marched from Skadar to Nerodimlje, where he besieged his father. Dečanski fled, and Dušan captured the treasury and family. He then pursued his father, catching up with him at Petrich. On 21 August 1331 Dečanski surrendered, and on the advice or insistence of Dušan's advisors, he was imprisoned. Dušan was crowned "King of All Serbian and Maritime lands" in the first week of September.