In 1086, following a naval battle, the Islamo-Sicilian city of Syracuse was blockaded by sea and besieged by land from May to October by the forces of the Norman county of Sicily. Following the death and flight of its leaders, the city surrendered.

The main source for the siege, the Norman historian Geoffrey Malaterra, dates it to 1085, but modern historians believes this to be a mistake for 1086.

The campaign had a religious character, being conceived in response to outrages perpetrated against churches and nuns and pitting Christians against Muslims.

Background In 1081, Benavert, the emir of Syracuse, acquired control of the city of Catania, displacing its emir. The city was soon conquered, however, by Jordan, the son of Count Roger I of Sicily.Valerie Eads, "Syracuse, Siege of", in Clifford J. Rogers (ed.), The Oxford Encyclopedia of Medieval Warfare and Military Technology (Oxford University Press, 2010). In the summer of 1084, Benavert launched a raid on Calabria. At Nicotera, his soldiers took the inhabitants into slavery; at Reggio, they razed two churches; and at a place called Rocca d'Asino, they raped some nuns and took them into captivity.Hubert Houben, Roger II of Sicily: A Ruler Between East and West (Cambridge University Press, 2002), p. 18. In response, Roger planned an attack on Syracuse. He was delayed by the death of his brother, Robert Guiscard, in July 1085 and the succession dispute between Robert's sons, Roger Borsa and Bohemond.Gordon S. Brown, The Norman Conquest of Southern Italy and Sicily (McFarland, 2003), p. 177. In October 1085, he ordered the construction of a fleet at Messina.Paul Brown, Mercenaries to Conquerors: Norman Warfare in the Eleventh and Twelfth-Century Mediterranean (Pen & Sword, 2016), pp. 109–111.

Battle On 20 May 1086, the Norman fleet set out from Messina. It made three stops en route, during one of which Roger went ashore and met with his son, who was commanding the ground forces, composed mostly of cavalry. By 22 May, the fleet had anchored north of Syracuse. A group of native Sicilians, fluent in Greek and Arabic and disguised as fishermen or merchants, was sent by boat to under the command of a certain Philip reconnoiter the Syracusan fleet and harbour. It returned on 24 May. Prior to battle, the men took communion.Paul E. Chevedden (2010), "'A Crusade from the First': The Norman Conquest of Islamic Sicily, 1060–1091", Al-Masāq 22(2): 191–225, at 211.Geoffrey Malaterra, The Deeds of Count Roger of Calabria and Sicily and of His Brother Duke Robert Guiscard, translated by Kenneth Baxter Wolf (University of Michigan Press, 2005), Book 4.2, pp. 177–179. The Normans attack at dawn on 25 May.

According to Malaterra, the Norman crossbows had the advantage at a distance, so the Syracusans decided to close in and attempt to board the Norman ships. Benavert personally led the attack on Roger's flagship. He was wounded by a javelin thrown by a Lombard named Lupino, although later legend transferred the blow to Count Roger. The Normans then successfully boarded his ship. Attempting to jump to another ship, he fell into the sea and was drowned. Those Syracusan ships which had not been captured then retreated to the harbour. Malaterra provides no information about the numbers of ships involved in the battle on either side.

Siege Following his victory at sea, Roger blockaded the city by sea and besieged it by land. Jordan led the land forces. Roger refused to allow his son to launch a direct attack.Randall Rogers, Latin Siege Warfare in the Twelfth Century (Oxford University Press, 1997), p. 99. At this point in his narrative, Malaterra offers rare criticism of his patron, Roger, claiming that "if Jordan had attack the city at this time, it would have been forced to surrender with little effort on his part" before noting that "his father impurdently forbid him from doing this". The land siege probably focussed on Ortygia. Meanwhile, the fleet launched raids on the enemy coast.

During the summer, the Christian prisoners were released, probably in order to reduce the demands on the defenders' food stores, although Malaterra believed it was a gesture meant to assuage the attackers in the hopes they would retreat. In October, Benavert's widow and his son, with some leading citizens, successfully rowed past the blockade. Abandoned by their leaders, the citizens of Syracuse surrendered unconditionally. The siege had lasted a little over four months.Graham Loud, The Age of Robert Guiscard: Southern Italy and the Norman Conquest (Pearson Educational, 2000), p. 172.

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