remnants of his army. At Nicosia Richard becomes ill; Guy of Lusignan in command of Richard's forces, marches on Kyrenia and captures it, taking the empress and her child prisoner. Isaac is taken before Richard (in chains of silver) and accepts an unconditional surrender. Richard places garrisons in the towns and castles, and appoints Richard de Camville as governor of Cyprus, jointly with Robert of Thornham. Autumn – Emperor Isaac II (Angelos) leads a punitive expedition against Grand Prince Stefan Nemanja. The Serbians are defeated at South Morava and retreat into the mountains. The Byzantine forces raid all lands around the bank of the river and burn down Stefan's court in Kuršumlija. Nemanja does not surrender and starts irregular warfare and Isaac negotiates a peace treaty. The Serbians are forced to give up a large part of their conquests, east of the Velika Morava, and recognize Byzantine rule. Isaac recognizes Nemanja as Grand Prince of Serbia. Third Crusade February 13 – Muslim forces attack and succeed in breaking the siege lines around Acre. Though the Crusaders seal the breach, Saladin is able to replenish the garrison, by sending reinforcements. For the defenders, this is a temporary respite – and Saladin is having difficulty keeping his army together. Taqi al-Din, Saladin's nephew and one of his most effective commanders, fails to rejoin the siege. He divides his army for his own territorial ambitions in modern southeastern Turkey. Later in the spring, Taqi al-Din brings his forces to support the double-siege at Acre. April 20 – King Philip II (Augustus) arrives with a Genoese flotilla (six ships) filled with French nobles and his cousin Conrad of Montferrat at Acre. He begins the construction of seven immense stone-throwers – which are used to bombard the city, on May 30. One of the siege-machines is called by the French soldiers the "Evil Neighbour" and "God's Own Sling", and a grappling ladder is known as the "Cat". Meanwhile, the walls of Acre are pounded relentlessly. The Crusaders built earthworks, ramparts, and ditches to protect themselves against Muslim attacks. June 8 – Richard I arrives with 25 ships and a strong advanced guard at Acre. Upon reaching the city, he is greeted by Philip II and then sets up his camp. Richard becomes almost immediately seriously ill (called Arnaldia) and is confined to his tent. Nevertheless, he leaps into action and secretly initiates negotiations with Saladin.