Editing 1263 (section)

==== Byzantine Empire ====
* Before July &ndash; [[Battle of Settepozzi]]: A Byzantine-Genoese fleet (some 50 galleys) is routed by the Venetians near [[Spetses]] in the [[Argolic Gulf]], who capture four ships and inflict considerable casualties. Later, the Genoese that survive the battle managed to capture [[Chania]] on [[Crete]]. They receive orders to avoid direct confrontations with the Venetian fleet, but instead are engaged in raiding against the Venetian merchant convoys in the [[Euripus Strait]].<ref>Lane, Frederic Chapin (1973). ''Venice, A Maritime Republic'', p. 77. Baltimore, Maryland: Johns Hopkins University Press. {{ISBN|0-8018-1445-6}}.</ref> 
* Summer &ndash; Emperor [[Michael VIII Palaiologos]] sends a Byzantine expeditionary force (some 3,500 men) led by his half-brother, [[Constantine Palaiologos (half-brother of Michael VIII)|Constantine Palaiologos]], to the [[Peloponnese]] in southern [[Greece]]. The army is transported to [[Monemvasia]] on Genoese ships, while a small Byzantine fleet is sent to harass the Latin island holdings in [[Euboea]] and the [[Cyclades]]. After arriving at Monemvasia, Constantine lays siege to [[Sparta]], while the Byzantine fleet seizes the southern coast of [[Laconia]].<ref>Bartusis, Mark C. (1997). ''The Late Byzantine Army: Arms and Society, 1204–1453'', p. 49. Philadelphia, Pennsylvania: University of Pennsylvania Press. {{ISBN|0-8122-1620-2}}.</ref> 
* [[Battle of Prinitza]]: Constantine Palaiologos marches the Byzantine army up the rivers [[Eurotas (river)|Eurotas]] and [[Alfeios]] towards the Achaean capital, [[Andravida]]. At a narrow pass at Prinitza (near [[Olympia, Greece|Ancient Olympia]]) in [[Elis]], the Byzantines are attacked by Achaean forces (some 300 horsemen) under [[John of Katavas]], who inflict a resounding defeat upon them; many Byzantine soldiers are killed. Constantine himself barely escapes with his life, and flees with the remainder of his army to the safety of [[Mystras]].<ref>Bartusis, Mark C. (1977). ''The Late Byzantine Army: Arms and Society, 1204–1453'', p. 50. Philadelphia, Pennsylvania: University of Pennsylvania Press. {{ISBN|0-8122-1620-2}}.</ref><ref>Longnon, Jean (1969). ''The Frankish States in Greece, 1204–1311'', pp. 253–254. In Wolff, Robert Lee; Hazard, Harry W. (eds.). ''A History of the Crusades, Volume II: The Later Crusades, 1189–1311'', pp. 234–275. University of Wisconsin Press. {{ISBN|0-299-06670-3}}.</ref>