Editing 1236 (section)

==== Byzantine Empire ====
* Spring &ndash; A fleet consisting of ships from the republics of [[Republic of Venice|Venice]], [[Republic of Genoa|Genoa]] and [[Republic of Pisa|Pisa]] arrive at [[Constantinople]]. It is headed by [[Geoffrey II of Villehardouin]], ruler of [[Principality of Achaea|Achaea]], who brings 100 of his own knights, 300 cross-bowman, and 500 archers. Geoffrey, formally a vassal of Emperor [[John of Brienne|John I of Constantinople]], breaks the blockade of the city, sinks 15 Byzantine ships and enters the [[Golden Horn]]. A treaty is signed for two years after the intervention of [[Angelo Sanudo]], duke of [[Duchy of the Archipelago|Archipelago]].<ref>Longnon, Jean (1969). ''The Frankish States in Greece, 1204–1311'', p. 219. Madison, Milwaukee, and London: University of Wisconsin Press. {{ISBN|0-299-04844-6}}.</ref>